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).
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Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2024-08-30. NVD baseline CVSS 9.8; sources differ by 2.5.
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).
August 30, 2024
May 12, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | libexpat1-dev (2.6.1-2ubuntu0.1) @ noble | 2026-05-19 | ubuntu |
| ubuntu | libxmltok1-dev (1.2-3ubuntu0.16.04.1~esm4) @ xenial | 2026-05-19 | ubuntu |
| ubuntu | libxmltok1t64 (1.2-4.1ubuntu2.24.0.4.1+esm1) @ noble | 2026-05-19 | ubuntu |
| ubuntu | libexpat1-dev (2.4.7-1ubuntu0.4) @ jammy | 2026-05-19 | ubuntu |
| redhat | service-interconnect/skupper-site-controller-rhel9:1.5.5-4 | 2024-12-16 | redhat |
| redhat | service-interconnect/skupper-site-controller-rhel9:1.4.7-3 | 2024-11-21 | redhat |
| redhat | rhcos-417.94.202411070820-0 | 2024-11-19 | redhat |
| redhat | xmlrpc-c-0:1.51.0-10.el8_10 | 2024-11-05 | redhat |
| redhat | rhcos-416.94.202410020522-0 | 2024-10-09 | redhat |
| redhat | service-interconnect/skupper-site-controller-rhel9:1.4.7-2 | 2024-09-26 | redhat |
| redhat | expat-0:2.2.5-15.el8_10 | 2024-09-24 | redhat |
| redhat | expat-0:2.5.0-2.el9_4.1 | 2024-09-18 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
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).
RHSA-2024:10135 — Moderate
RHSA-2024:11109 — Moderate
RHSA-2024:6754 — Moderate
RHSA-2024:6989 — Moderate
RHSA-2024:7213 — Moderate
RHSA-2024:7599 — Moderate
RHSA-2024:8859 — Moderate
Expat vulnerabilities
Expat vulnerabilities
xmltok library vulnerabilities
xmltok library vulnerabilities
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-45491
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msrc · redhat
CWE-190