CVE catalog

CVE-2026-86139

In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.

Severity: Medium · CVSS 6.9CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Published: Sep 5, 2026, 4:23:14 AM UTC
Updated: Sep 5, 2026, 5:17:12 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.17% · Oct 25, 2026

In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.

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	libxml2	sid	`2.15.4+dfsg-1`	fixed
Debian	libxml2	forky	`2.15.4+dfsg-1`	fixed
Debian	libxml2	trixie	`2.12.7+dfsg+really2.9.14-2.1+deb13u3`	vulnerable
Debian	libxml2	trixie-security	`2.12.7+dfsg+really2.9.14-2.1+deb13u1`	vulnerable
Debian	libxml2	bookworm	`2.9.14+dfsg-1.3~deb12u6`	not affected
Debian	libxml2	bookworm-security	`2.9.14+dfsg-1.3~deb12u4`	not affected
Cpe	libxml2	Not reported	`2.15.4`	fixed
Ubuntu	libxml2	noble	`2.9.14+dfsg-1.3ubuntu3.10`	fixed
Ubuntu	libxml2-dev	noble	`2.9.14+dfsg-1.3ubuntu3.10`	fixed
Ubuntu	libxml2-doc	noble	`2.9.14+dfsg-1.3ubuntu3.10`	fixed
Ubuntu	libxml2-utils	noble	`2.9.14+dfsg-1.3ubuntu3.10`	fixed
Ubuntu	python3-libxml2	noble	`2.9.14+dfsg-1.3ubuntu3.10`	fixed
Ubuntu	libxml2	26.04	`2.14.5+dfsg-0.2`	vulnerable
Ubuntu	libxml2	26.04	`2.14.5+dfsg-0.2build1`	vulnerable
Ubuntu	libxml2	26.04	`2.15.1+dfsg-0.3`	vulnerable
Ubuntu	libxml2	26.04	`2.15.1+dfsg-0.4`	vulnerable
Ubuntu	libxml2	26.04	`2.15.1+dfsg-1`	vulnerable
Ubuntu	libxml2	26.04	`2.15.1+dfsg-2`	vulnerable
Ubuntu	libxml2	26.04	`2.15.1+dfsg-2ubuntu1`	vulnerable
Ubuntu	libxml2	26.04	`2.15.1+dfsg-2ubuntu2`	vulnerable
Ubuntu	libxml2	26.04	`2.15.2+dfsg-0.1`	vulnerable
Ubuntu	libxml2	26.04	`2.15.2+dfsg-0.1ubuntu0.1`	vulnerable
Ubuntu	libxml2	26.04	`2.15.2+dfsg-0.1ubuntu0.2`	vulnerable
Ubuntu	libxml2	26.04	`2.15.2+dfsg-0.1ubuntu0.3`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libxml2	source	sid	`2.15.4+dfsg-1`	not yet assigned	Not reported	[1146744]
Debian	libxml2	source	forky	`2.15.4+dfsg-1`	not yet assigned	Not reported	[1146744]
Debian	libxml2	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1146744]
Debian	libxml2	source	bookworm	`Not affected`	unimportant	Not reported	[1146744]
Cpe	libxml2	cpe	Not reported	`2.15.4`	Not reported	NVD-CVE-2026-86139	Not reported
Ubuntu	libxml2	deb	noble	`2.9.14+dfsg-1.3ubuntu3.10`	Not reported	Not reported	Not reported
Ubuntu	libxml2-dev	deb	noble	`2.9.14+dfsg-1.3ubuntu3.10`	Not reported	Not reported	Not reported
Ubuntu	libxml2-doc	deb	noble	`2.9.14+dfsg-1.3ubuntu3.10`	Not reported	Not reported	Not reported
Ubuntu	libxml2-utils	deb	noble	`2.9.14+dfsg-1.3ubuntu3.10`	Not reported	Not reported	Not reported
Ubuntu	python3-libxml2	deb	noble	`2.9.14+dfsg-1.3ubuntu3.10`	Not reported	Not reported	Not reported
Ubuntu	libxml2	deb	26.04	`2.15.2+dfsg-0.1ubuntu0.3`	Not reported	UBUNTU-CVE-2026-86139	Not reported

[Debian bug #1146744]

OpenFactory catalog packages

[Debian 13 (Trixie)]

[libxml2]Affected
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[libxml2-dev]Affected
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[libxml2-doc]Affected
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · all · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · all · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · all · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · all · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[libxml2-utils]Affected
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[python3-libxml2]Affected
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13

[Debian 12 (Bookworm)]

[libxml2]Not affected
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
[libxml2-dev]Not affected
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
[libxml2-doc]Not affected
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · all · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u6 · all · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · all · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · all · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
[libxml2-utils]Not affected
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
[python3-libxml2]Not affected
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Not affected
  nvd · libxml2 · debian · bookworm

Observed: Oct 27, 2026, 6:50:15 AM UTC

References

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