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PYSEC-2021-66
Vulnerability from pysec - Published: 2021-02-01 20:15 - Updated: 2021-03-22 16:34
VLAI
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDoS vulnerability is mainly due to the _punctuation_re regex operator and its use of multiple wildcards. The last wildcard is the most exploitable as it searches for trailing punctuation. This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Impacted products
| Name | purl | jinja2 | pkg:pypi/jinja2 |
|---|
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "jinja2",
"purl": "pkg:pypi/jinja2"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.11.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0rc1",
"2.0",
"2.1",
"2.1.1",
"2.2",
"2.2.1",
"2.3",
"2.3.1",
"2.4",
"2.4.1",
"2.5",
"2.5.1",
"2.5.2",
"2.5.3",
"2.5.4",
"2.5.5",
"2.6",
"2.7",
"2.7.1",
"2.7.2",
"2.7.3",
"2.8",
"2.8.1",
"2.9",
"2.9.1",
"2.9.2",
"2.9.3",
"2.9.4",
"2.9.5",
"2.9.6",
"2.10",
"2.10.1",
"2.10.2",
"2.10.3",
"2.11.0",
"2.11.1",
"2.11.2"
]
}
],
"aliases": [
"CVE-2020-28493",
"SNYK-PYTHON-JINJA2-1012994",
"GHSA-g3rq-g295-4j3m"
],
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDoS vulnerability is mainly due to the `_punctuation_re regex` operator and its use of multiple wildcards. The last wildcard is the most exploitable as it searches for trailing punctuation. This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "PYSEC-2021-66",
"modified": "2021-03-22T16:34:00Z",
"published": "2021-02-01T20:15:00Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "ADVISORY",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4/"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
}
]
}
BREW-FORD-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:48 – Updated: 2026-09-09 23:58 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "ford",
"purl": "pkg:brew/ford"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "7.0.13_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-ford-CVE-2020-28493",
"modified": "2026-09-09T23:58:41Z",
"published": "2026-08-13T16:48:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-FUSESOC-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:49 – Updated: 2026-09-09 23:59 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "fusesoc",
"purl": "pkg:brew/fusesoc"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-fusesoc-CVE-2020-28493",
"modified": "2026-09-09T23:59:21Z",
"published": "2026-08-13T16:49:03Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-FWUPD-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:49 – Updated: 2026-09-09 23:59 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "fwupd",
"purl": "pkg:brew/fwupd"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.7"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-fwupd-CVE-2020-28493",
"modified": "2026-09-09T23:59:22Z",
"published": "2026-08-13T16:49:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-GALLERY-DL-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:49 – Updated: 2026-09-09 23:59 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "gallery-dl",
"purl": "pkg:brew/gallery-dl"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.32.9"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-gallery-dl-CVE-2020-28493",
"modified": "2026-09-09T23:59:22Z",
"published": "2026-08-13T16:49:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-GCOVR-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:49 – Updated: 2026-09-09 23:59 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "gcovr",
"purl": "pkg:brew/gcovr"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "8.6_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-gcovr-CVE-2020-28493",
"modified": "2026-09-09T23:59:25Z",
"published": "2026-08-13T16:49:07Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-GDBGUI-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:49 – Updated: 2026-09-17 19:09 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "gdbgui",
"purl": "pkg:brew/gdbgui"
},
"ranges": [
{
"events": [
{
"introduced": "0.13.2.0"
},
{
"fixed": "0.15.0.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-gdbgui-CVE-2020-28493",
"modified": "2026-09-17T19:09:55Z",
"published": "2026-08-13T16:49:15Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-GI-DOCGEN-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:50 – Updated: 2026-09-10 19:17 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "gi-docgen",
"purl": "pkg:brew/gi-docgen"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2026.1_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-gi-docgen-CVE-2020-28493",
"modified": "2026-09-10T19:17:34Z",
"published": "2026-08-13T16:50:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-GIXY-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:51 – Updated: 2026-09-10 00:02 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "gixy",
"purl": "pkg:brew/gixy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.2.50"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-gixy-CVE-2020-28493",
"modified": "2026-09-10T00:02:03Z",
"published": "2026-08-13T16:51:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-GLANCES-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:51 – Updated: 2026-09-10 19:18 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "glances",
"purl": "pkg:brew/glances"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.5.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-glances-CVE-2020-28493",
"modified": "2026-09-10T19:18:35Z",
"published": "2026-08-13T16:51:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
BREW-GRIP-CVE-2020-28493 (GHSA-G3RQ-G295-4J3M)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:55 – Updated: 2026-09-10 00:06 – Source website
VLAI
Summary
Regular Expression Denial of Service (ReDoS) in Jinja2
Details
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Severity
5.3 (Medium)
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "jinja2",
"resource_purl": "pkg:pypi/jinja2@3.1.6",
"upstream_fixed_in": "2.11.3"
},
"package": {
"ecosystem": "Homebrew",
"name": "grip",
"purl": "pkg:brew/grip"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.6.2_21"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/jinja2@3.1.6",
"name": "jinja2",
"resource": "jinja2",
"strategy": "registry",
"subject_version": "3.1.6"
}
]
},
"details": "This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.",
"id": "BREW-grip-CVE-2020-28493",
"modified": "2026-09-10T00:06:27Z",
"published": "2026-08-13T16:55:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28493"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/pull/1343"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-g3rq-g295-4j3m"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/jinja"
},
{
"type": "WEB",
"url": "https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202107-19"
},
{
"type": "WEB",
"url": "https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Regular Expression Denial of Service (ReDoS) in Jinja2",
"upstream": [
"GHSA-g3rq-g295-4j3m",
"CVE-2020-28493",
"PYSEC-2021-66",
"SNYK-PYTHON-JINJA2-1012994"
]
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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