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49 vulnerabilities by libexpat_project
CVE-2026-7210 (GCVE-0-2026-7210)
Vulnerability from cvelistv5 – Published: 2026-05-11 17:19 – Updated: 2026-05-11 20:34
VLAI
Title
The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
Summary
`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.
Severity
CWE
- CWE-331 - Insufficient entropy
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://mail.python.org/archives/list/security-an… | vendor-advisory |
| https://github.com/python/cpython/pull/149023 | patch |
| https://github.com/python/cpython/issues/149018 | issue-tracking |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.15.0
(python)
|
Credits
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CVE-2026-45186 (GCVE-0-2026-45186)
Vulnerability from cvelistv5 – Published: 2026-05-10 06:36 – Updated: 2026-05-11 22:23
VLAI
Summary
In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
Severity
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.8.1
(semver)
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CVE-2026-41080 (GCVE-0-2026-41080)
Vulnerability from cvelistv5 – Published: 2026-04-16 16:52 – Updated: 2026-05-18 20:22
VLAI
Summary
libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
Severity
CWE
- CWE-331 - Insufficient Entropy
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.8.0
(semver)
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CVE-2026-32778 (GCVE-0-2026-32778)
Vulnerability from cvelistv5 – Published: 2026-03-16 07:02 – Updated: 2026-03-17 14:39
VLAI
Summary
libexpat before 2.7.5 allows a NULL pointer dereference in the function setContext on retry after an earlier ouf-of-memory condition.
Severity
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.7.5
(semver)
|
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CVE-2026-32777 (GCVE-0-2026-32777)
Vulnerability from cvelistv5 – Published: 2026-03-16 06:58 – Updated: 2026-03-16 14:55
VLAI
Summary
libexpat before 2.7.5 allows an infinite loop while parsing DTD content.
Severity
4 (Medium)
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.7.5
(semver)
|
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CVE-2026-32776 (GCVE-0-2026-32776)
Vulnerability from cvelistv5 – Published: 2026-03-16 06:54 – Updated: 2026-03-16 14:58
VLAI
Summary
libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.
Severity
4 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.7.5
(semver)
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CVE-2026-25210 (GCVE-0-2026-25210)
Vulnerability from cvelistv5 – Published: 2026-01-30 06:40 – Updated: 2026-04-30 03:55
VLAI
Summary
In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.
Severity
6.9 (Medium)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.7.4
(semver)
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CVE-2026-24515 (GCVE-0-2026-24515)
Vulnerability from cvelistv5 – Published: 2026-01-23 07:46 – Updated: 2026-01-23 15:31
VLAI
Summary
In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.
Severity
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.7.4
(semver)
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CVE-2025-66382 (GCVE-0-2025-66382)
Vulnerability from cvelistv5 – Published: 2025-11-28 00:00 – Updated: 2026-05-12 12:08
VLAI
Summary
In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.
Severity
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , ≤ 2.7.5
(semver)
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CVE-2025-59375 (GCVE-0-2025-59375)
Vulnerability from cvelistv5 – Published: 2025-09-15 00:00 – Updated: 2026-05-12 12:08
VLAI
Summary
libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| libexpat project | libexpat |
Affected:
0 , < 2.7.2
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CVE-2024-50602 (GCVE-0-2024-50602)
Vulnerability from cvelistv5 – Published: 2024-10-27 00:00 – Updated: 2025-04-30 20:03
VLAI
Summary
An issue was discovered in libexpat before 2.6.4. There is a crash within the XML_ResumeParser function because XML_StopParser can stop/suspend an unstarted parser.
Severity
5.9 (Medium)
CWE
- n/a
Assigner
References
1 reference
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CVE-2024-45492 (GCVE-0-2024-45492)
Vulnerability from cvelistv5 – Published: 2024-08-30 00:00 – Updated: 2026-05-12 11:57
VLAI
Summary
An issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer overflow for m_groupSize on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
Severity
7.3 (High)
CWE
- n/a
Assigner
References
2 references
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CVE-2024-45491 (GCVE-0-2024-45491)
Vulnerability from cvelistv5 – Published: 2024-08-30 00:00 – Updated: 2026-05-12 11:57
VLAI
Summary
An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).
Severity
7.3 (High)
CWE
- n/a
Assigner
References
2 references
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CVE-2024-45490 (GCVE-0-2024-45490)
Vulnerability from cvelistv5 – Published: 2024-08-30 00:00 – Updated: 2026-05-12 11:57
VLAI
Summary
An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
2 references
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CVE-2024-28757 (GCVE-0-2024-28757)
Vulnerability from cvelistv5 – Published: 2024-03-10 00:00 – Updated: 2025-11-04 22:06
VLAI
Summary
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
Severity
7.5 (High)
CWE
- n/a
Assigner
References
7 references
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CVE-2023-52426 (GCVE-0-2023-52426)
Vulnerability from cvelistv5 – Published: 2024-02-04 00:00 – Updated: 2025-11-04 18:21
VLAI
Summary
libexpat through 2.5.0 allows recursive XML Entity Expansion if XML_DTD is undefined at compile time.
Severity
5.5 (Medium)
CWE
- n/a
Assigner
References
6 references
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CVE-2023-52425 (GCVE-0-2023-52425)
Vulnerability from cvelistv5 – Published: 2024-02-04 00:00 – Updated: 2025-11-04 18:21
VLAI
Summary
libexpat through 2.5.0 allows a denial of service (resource consumption) because many full reparsings are required in the case of a large token for which multiple buffer fills are needed.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
6 references
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CVE-2022-43680 (GCVE-0-2022-43680)
Vulnerability from cvelistv5 – Published: 2022-10-24 00:00 – Updated: 2025-05-30 19:20
VLAI
Summary
In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
15 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/650 | |
| https://github.com/libexpat/libexpat/issues/649 | |
| https://github.com/libexpat/libexpat/pull/616 | |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-list |
| https://www.debian.org/security/2022/dsa-5266 | vendor-advisory |
| https://security.gentoo.org/glsa/202210-38 | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2022111… | |
| http://www.openwall.com/lists/oss-security/2023/12/28/5 | mailing-list |
| http://www.openwall.com/lists/oss-security/2024/01/03/5 | mailing-list |
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CVE-2022-40674 (GCVE-0-2022-40674)
Vulnerability from cvelistv5 – Published: 2022-09-14 00:00 – Updated: 2025-05-30 19:18
VLAI
Summary
libexpat before 2.4.9 has a use-after-free in the doContent function in xmlparse.c.
Severity
8.1 (High)
CWE
- n/a
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/629 | |
| https://github.com/libexpat/libexpat/pull/640 | |
| https://www.debian.org/security/2022/dsa-5236 | vendor-advisory |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-list |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2022102… | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.gentoo.org/glsa/202211-06 | vendor-advisory |
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CVE-2022-25314 (GCVE-0-2022-25314)
Vulnerability from cvelistv5 – Published: 2022-02-18 04:25 – Updated: 2025-05-05 16:23
VLAI
Summary
In Expat (aka libexpat) before 2.4.5, there is an integer overflow in copyString.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/560 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/02/19/1 | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2022/dsa-5085 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022030… | x_refsource_CONFIRM |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-25315 (GCVE-0-2022-25315)
Vulnerability from cvelistv5 – Published: 2022-02-18 04:24 – Updated: 2025-05-05 16:23
VLAI
Summary
In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/559 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/02/19/1 | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2022/dsa-5085 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022030… | x_refsource_CONFIRM |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-25313 (GCVE-0-2022-25313)
Vulnerability from cvelistv5 – Published: 2022-02-18 04:23 – Updated: 2025-05-30 19:43
VLAI
Summary
In Expat (aka libexpat) before 2.4.5, an attacker can trigger stack exhaustion in build_model via a large nesting depth in the DTD element.
Severity
6.5 (Medium)
CWE
- n/a
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/558 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/02/19/1 | mailing-listx_refsource_MLIST |
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| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022030… | x_refsource_CONFIRM |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-25235 (GCVE-0-2022-25235)
Vulnerability from cvelistv5 – Published: 2022-02-16 00:40 – Updated: 2025-05-05 16:23
VLAI
Summary
xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/562 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/02/19/1 | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2022/dsa-5085 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022030… | x_refsource_CONFIRM |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-25236 (GCVE-0-2022-25236)
Vulnerability from cvelistv5 – Published: 2022-02-16 00:39 – Updated: 2025-05-05 16:23
VLAI
Summary
xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
11 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/561 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/02/19/1 | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2022/dsa-5085 | vendor-advisoryx_refsource_DEBIAN |
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| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022030… | x_refsource_CONFIRM |
| http://packetstormsecurity.com/files/167238/Zoom-… | x_refsource_MISC |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-23990 (GCVE-0-2022-23990)
Vulnerability from cvelistv5 – Published: 2022-01-26 18:02 – Updated: 2025-05-05 16:24
VLAI
Summary
Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/551 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.debian.org/security/2022/dsa-5073 | vendor-advisoryx_refsource_DEBIAN |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://www.tenable.com/security/tns-2022-05 | x_refsource_CONFIRM |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-23852 (GCVE-0-2022-23852)
Vulnerability from cvelistv5 – Published: 2022-01-24 01:06 – Updated: 2025-05-05 16:25
VLAI
Summary
Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/550 | x_refsource_MISC |
| https://www.debian.org/security/2022/dsa-5073 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://www.oracle.com/security-alerts/cpuapr2022.html | x_refsource_MISC |
| https://www.tenable.com/security/tns-2022-05 | x_refsource_CONFIRM |
| https://security.netapp.com/advisory/ntap-2022021… | x_refsource_CONFIRM |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-22822 (GCVE-0-2022-22822)
Vulnerability from cvelistv5 – Published: 2022-01-08 02:57 – Updated: 2025-05-05 16:29
VLAI
Summary
addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/539 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/01/17/3 | mailing-listx_refsource_MLIST |
| https://www.tenable.com/security/tns-2022-05 | x_refsource_CONFIRM |
| https://www.debian.org/security/2022/dsa-5073 | vendor-advisoryx_refsource_DEBIAN |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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CVE-2022-22823 (GCVE-0-2022-22823)
Vulnerability from cvelistv5 – Published: 2022-01-08 02:57 – Updated: 2025-05-05 16:29
VLAI
Summary
build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
6 references
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|---|---|
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| http://www.openwall.com/lists/oss-security/2022/01/17/3 | mailing-listx_refsource_MLIST |
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CVE-2022-22824 (GCVE-0-2022-22824)
Vulnerability from cvelistv5 – Published: 2022-01-08 02:56 – Updated: 2025-05-05 16:29
VLAI
Summary
defineAttribute in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
Severity
9.8 (Critical)
CWE
- n/a
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/539 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/01/17/3 | mailing-listx_refsource_MLIST |
| https://www.tenable.com/security/tns-2022-05 | x_refsource_CONFIRM |
| https://www.debian.org/security/2022/dsa-5073 | vendor-advisoryx_refsource_DEBIAN |
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CVE-2022-22825 (GCVE-0-2022-22825)
Vulnerability from cvelistv5 – Published: 2022-01-08 02:56 – Updated: 2025-05-05 16:29
VLAI
Summary
lookup in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
Severity
8.8 (High)
CWE
- n/a
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/libexpat/libexpat/pull/539 | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2022/01/17/3 | mailing-listx_refsource_MLIST |
| https://www.tenable.com/security/tns-2022-05 | x_refsource_CONFIRM |
| https://www.debian.org/security/2022/dsa-5073 | vendor-advisoryx_refsource_DEBIAN |
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| https://security.gentoo.org/glsa/202209-24 | vendor-advisoryx_refsource_GENTOO |
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