ubuntu-cve-2021-27291
Vulnerability from osv_ubuntu
Published
2021-03-17 13:15
Modified
2026-05-20 14:53
Summary
Details
In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "python-pygments",
"binary_version": "1.6+dfsg-1ubuntu1.1+esm1"
},
{
"binary_name": "python3-pygments",
"binary_version": "1.6+dfsg-1ubuntu1.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "pygments",
"purl": "pkg:deb/ubuntu/pygments@1.6+dfsg-1ubuntu1.1+esm1?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6+dfsg-1ubuntu1.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6+dfsg-1",
"1.6+dfsg-1build1",
"1.6+dfsg-1ubuntu1",
"1.6+dfsg-1ubuntu1.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python-pygments",
"binary_version": "2.1+dfsg-1ubuntu0.2"
},
{
"binary_name": "python3-pygments",
"binary_version": "2.1+dfsg-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "pygments",
"purl": "pkg:deb/ubuntu/pygments@2.1+dfsg-1ubuntu0.2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1+dfsg-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.1+dfsg-1.1svn1",
"2.0.1+dfsg-1.1ubuntu1",
"2.1+dfsg-1",
"2.1+dfsg-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "eric",
"binary_version": "6.0.8-1"
},
{
"binary_name": "eric-api-files",
"binary_version": "6.0.8-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "eric",
"purl": "pkg:deb/ubuntu/eric@6.0.8-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"6.0.8-1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python-pygments",
"binary_version": "2.2.0+dfsg-1ubuntu0.2"
},
{
"binary_name": "python3-pygments",
"binary_version": "2.2.0+dfsg-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "pygments",
"purl": "pkg:deb/ubuntu/pygments@2.2.0+dfsg-1ubuntu0.2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.2.0+dfsg-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.0+dfsg-1",
"2.2.0+dfsg-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "eric",
"binary_version": "17.11.1-1"
},
{
"binary_name": "eric-api-files",
"binary_version": "17.11.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "eric",
"purl": "pkg:deb/ubuntu/eric@17.11.1-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"17.08-1",
"17.11.1-1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python-pygments",
"binary_version": "2.3.1+dfsg-1ubuntu2.2"
},
{
"binary_name": "python3-pygments",
"binary_version": "2.3.1+dfsg-1ubuntu2.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "pygments",
"purl": "pkg:deb/ubuntu/pygments@2.3.1+dfsg-1ubuntu2.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.1+dfsg-1ubuntu2.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.1+dfsg-1ubuntu1",
"2.3.1+dfsg-1ubuntu2",
"2.3.1+dfsg-1ubuntu2.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "eric",
"binary_version": "20.2+ds1-1"
},
{
"binary_name": "eric-api-files",
"binary_version": "20.2+ds1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "eric",
"purl": "pkg:deb/ubuntu/eric@20.2+ds1-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"19.02.1+ds1-1",
"19.8+ds1-1",
"19.12+ds1-1",
"20.1+ds1-1",
"20.2+ds1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "eric",
"binary_version": "21.1+ds1-2"
},
{
"binary_name": "eric-api-files",
"binary_version": "21.1+ds1-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "eric",
"purl": "pkg:deb/ubuntu/eric@21.1+ds1-2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"21.1+ds1-1",
"21.1+ds1-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "eric",
"binary_version": "23.2+ds1-2ubuntu1"
},
{
"binary_name": "eric-api-files",
"binary_version": "23.2+ds1-2ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "eric",
"purl": "pkg:deb/ubuntu/eric@23.2+ds1-2ubuntu1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"23.2+ds1-1",
"23.2+ds1-2",
"23.2+ds1-2ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "eric",
"binary_version": "24.8+ds1-1"
},
{
"binary_name": "eric-api-files",
"binary_version": "24.8+ds1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "eric",
"purl": "pkg:deb/ubuntu/eric@24.8+ds1-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"24.3+ds1-1",
"24.8+ds1-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "eric",
"binary_version": "24.8+ds1-1"
},
{
"binary_name": "eric-api-files",
"binary_version": "24.8+ds1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "eric",
"purl": "pkg:deb/ubuntu/eric@24.8+ds1-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"24.8+ds1-1"
]
}
],
"aliases": [],
"details": "In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.",
"id": "UBUNTU-CVE-2021-27291",
"modified": "2026-05-20T14:53:11Z",
"published": "2021-03-17T13:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-27291"
},
{
"type": "REPORT",
"url": "https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4897-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4897-2"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-27291"
}
],
"related": [
"USN-4897-1",
"USN-4897-2"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-27291"
]
}
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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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