CVE catalog

CVE-2024-45491

xmltok library vulnerabilities

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Aug 29, 2024, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.13% · Oct 25, 2026

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).

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	expat	sid	`2.9.0-1`	fixed
Debian	expat	forky	`2.9.0-1`	fixed
Debian	expat	trixie	`2.8.3-1~deb13u1`	fixed
Debian	expat	trixie-security	`2.9.0-1~deb13u1`	fixed
Debian	expat	bookworm	`2.5.0-1+deb12u2`	fixed
Debian	expat	bookworm-security	`2.5.0-1+deb12u5`	fixed
Debian	libxmltok	bookworm	`1.2-4`	vulnerable
Ubuntu	libxmltok	noble	Not reported	vulnerable
Ubuntu	expat	noble	`2.5.0-1+deb12u1`	fixed
Ubuntu	libxmltok	noble	`1.2-4.1ubuntu2.24.0.4.1+esm1`	fixed
Ubuntu	libxmltok1-dev	noble	`1.2-4.1ubuntu2.24.0.4.1+esm1`	fixed
Ubuntu	libxmltok1t64	noble	`1.2-4.1ubuntu2.24.0.4.1+esm1`	fixed
Ubuntu	expat	noble	`2.6.1-2ubuntu0.1`	fixed
Ubuntu	libexpat1	noble	`2.6.1-2ubuntu0.1`	fixed
Ubuntu	libexpat1-dev	noble	`2.6.1-2ubuntu0.1`	fixed
Alpine	expat	3.17	`2.6.3-r0`	fixed
Alpine	expat	3.18	`2.6.3-r0`	fixed
Alpine	expat	3.19	`2.6.3-r0`	fixed
Alpine	expat	3.20	`2.6.3-r0`	fixed
Alpine	expat	3.21	`2.6.3-r0`	fixed
Alpine	expat	3.22	`2.6.3-r0`	fixed
Alpine	expat	3.23	`2.6.3-r0`	fixed
Alpine	expat	3.24	`2.6.3-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	expat	source	sid	`2.6.2-2`	not yet assigned	Not reported	[1080150]
Debian	expat	source	forky	`2.6.2-2`	not yet assigned	Not reported	[1080150]
Debian	expat	source	trixie	`2.6.2-2`	not yet assigned	Not reported	[1080150]
Debian	expat	source	bookworm	`2.5.0-1+deb12u1`	not yet assigned	Not reported	[1080150]
Debian	libxmltok	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Ubuntu	expat	deb	noble	`2.5.0-1+deb12u1`	Not reported	Not reported	Not reported
Ubuntu	libxmltok	deb	noble	`1.2-4.1ubuntu2.24.0.4.1+esm1`	Not reported	Not reported	Not reported
Ubuntu	libxmltok1-dev	deb	noble	`1.2-4.1ubuntu2.24.0.4.1+esm1`	Not reported	Not reported	Not reported
Ubuntu	libxmltok1t64	deb	noble	`1.2-4.1ubuntu2.24.0.4.1+esm1`	Not reported	Not reported	Not reported
Ubuntu	expat	deb	noble	`2.6.1-2ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libexpat1	deb	noble	`2.6.1-2ubuntu0.1`	Not reported	Not reported	Not reported
Ubuntu	libexpat1-dev	deb	noble	`2.6.1-2ubuntu0.1`	Not reported	Not reported	Not reported
Alpine	expat	apk	3.17	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported
Alpine	expat	apk	3.18	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported
Alpine	expat	apk	3.19	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported
Alpine	expat	apk	3.20	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported
Alpine	expat	apk	3.21	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported
Alpine	expat	apk	3.22	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported
Alpine	expat	apk	3.23	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported
Alpine	expat	apk	3.24	`2.6.3-r0`	Not reported	ALPINE-CVE-2024-45491	Not reported

[Debian bug #1080150]

Notes

[bookworm] libxmltok: Minor issue, no runtime dependencies left

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libxmltok1]Affected
Source package: [libxmltok]
Details (2)
- 1.2-4 · amd64 · bookworm
  Affected
  usn · libxmltok · debian · bookworm; usn · libxmltok · debian · 12
- 1.2-4 · arm64 · bookworm
  Affected
  usn · libxmltok · debian · bookworm; usn · libxmltok · debian · 12
[libxmltok1-dev]Affected
Source package: [libxmltok]
Details (2)
- 1.2-4 · amd64 · bookworm
  Affected
  usn · libxmltok · debian · bookworm; usn · libxmltok · debian · 12
- 1.2-4 · arm64 · bookworm
  Affected
  usn · libxmltok · debian · bookworm; usn · libxmltok · debian · 12
[expat]Fixed
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
[libexpat1]Fixed
Source package: [expat]
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
[libexpat1-dev]Fixed
Source package: [expat]
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Fixed · Fixed: 2.5.0-1+deb12u1
  usn · expat · debian · bookworm; usn · expat · debian · 12

[Debian 13 (Trixie)]

[expat]Fixed
Details (6)
- 2.7.1-2 · amd64 · trixie
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.7.1-2 · arm64 · trixie
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.2-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.3-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.3-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.9.0-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
[libexpat1]Fixed
Source package: [expat]
Details (6)
- 2.7.1-2 · amd64 · trixie
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.7.1-2 · arm64 · trixie
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.2-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.3-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.3-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.9.0-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
[libexpat1-dev]Fixed
Source package: [expat]
Details (6)
- 2.7.1-2 · amd64 · trixie
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.7.1-2 · arm64 · trixie
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.2-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.3-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.8.3-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13
- 2.9.0-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 2.6.2-2
  usn · expat · debian · 13

Observed: Oct 27, 2026, 7:03:01 PM UTC

References

[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]