CVE catalog

CVE-2026-113351

expat: CVE-2026-113351

Severity: Medium
Published: Oct 20, 2026, 11:17:19 AM UTC
Source: [NVD] · [CVE record]

libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.

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`	vulnerable
Debian	expat	forky	`2.9.0-1`	vulnerable
Debian	expat	trixie	`2.8.3-1~deb13u1`	vulnerable
Debian	expat	trixie-security	`2.9.0-1~deb13u1`	vulnerable
Debian	expat	bookworm	`2.5.0-1+deb12u2`	vulnerable
Debian	expat	bookworm-security	`2.5.0-1+deb12u5`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	expat	source	sid	`(unfixed)`	not yet assigned	Not reported	[1151840]
Debian	expat	source	forky	`(unfixed)`	not yet assigned	Not reported	[1151840]
Debian	expat	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1151840]
Debian	expat	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1151840]

[Debian bug #1151840]

Notes

[trixie] expat: Minor issue [bookworm] expat: Minor issue; can be fixed in next update

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[expat]Affected
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
[libexpat1]Affected
Source package: [expat]
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
[libexpat1-dev]Affected
Source package: [expat]
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · expat · debian · bookworm; dsa · expat · debian · 12

[Debian 13 (Trixie)]

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

Observed: Oct 24, 2026, 8:37:22 AM UTC

References

[Debian Security Tracker] · [OSV Package Vulnerability Database]