CVE catalog

CVE-2026-56002

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.

[CVE catalog]

Severity: High · CVSS 8.5
Published: Jul 8, 2026, 8:06:28 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.43% · Oct 22, 2026

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.

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	libxfont	sid	`1:2.0.9-1`	fixed
Debian	libxfont	forky	`1:2.0.9-1`	fixed
Debian	libxfont	trixie	`1:2.0.6-1+deb13u1`	fixed
Debian	libxfont	trixie-security	`1:2.0.6-1+deb13u1`	fixed
Debian	libxfont	bookworm	`1:2.0.6-1`	vulnerable
Debian	libxfont	bookworm-security	`1:2.0.6-1+deb12u1`	fixed
Cpe	libxfont	Not reported	`1:2.0.6-1+deb13u1build0.24.04.2`	fixed
Cpe	libxfont-dev	Not reported	`1:2.0.6-1+deb13u1build0.24.04.2`	fixed
Cpe	libxfont2	Not reported	`1:2.0.6-1+deb13u1build0.24.04.2`	fixed
Ubuntu	libxfont	pro	`1:2.0.3-1`	vulnerable
Ubuntu	libxfont	pro	`1:2.0.3-1ubuntu0.20.04.1~esm2`	fixed
Ubuntu	libxfont2	16.04	`1:2.0.1-3~ubuntu16.04.1`	vulnerable
Ubuntu	libxfont2	16.04	`1:2.0.1-3~ubuntu16.04.2`	vulnerable
Ubuntu	libxfont2	16.04	`1:2.0.1-3~ubuntu16.04.3`	vulnerable
Ubuntu	libxfont	22.04	`1:2.0.4-1build3`	vulnerable
Ubuntu	libxfont	22.04	`1:2.0.5-1`	vulnerable
Ubuntu	libxfont	22.04	`1:2.0.5-1build1`	vulnerable
Ubuntu	libxfont	22.04	`1:2.0.5-1ubuntu0.2`	fixed
Ubuntu	libxfont	24.04	`1:2.0.6-1`	vulnerable
Ubuntu	libxfont	24.04	`1:2.0.6-1build1`	vulnerable
Ubuntu	libxfont	24.04	`1:2.0.6-1+deb13u1build0.24.04.2`	fixed
Ubuntu	libxfont	25.10	`1:2.0.6-1build1`	vulnerable
Ubuntu	libxfont	26.04	`1:2.0.6-1build1`	vulnerable
Ubuntu	libxfont	26.04	`1:2.0.6-1build2`	vulnerable
Ubuntu	libxfont	26.04	`1:2.0.6-2`	vulnerable
Ubuntu	libxfont	26.04	`1:2.0.6-2ubuntu0.2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libxfont	source	sid	`1:2.0.8-1`	not yet assigned	Not reported	[1141702]
Debian	libxfont	source	forky	`1:2.0.8-1`	not yet assigned	Not reported	[1141702]
Debian	libxfont	source	trixie	`1:2.0.6-1+deb13u1`	not yet assigned	Not reported	[1141702]
Debian	libxfont	source	bookworm	`1:2.0.6-1+deb12u1`	not yet assigned	Not reported	[1141702]
Cpe	libxfont	cpe	Not reported	`1:2.0.6-1+deb13u1build0.24.04.2`	Not reported	Not reported	Not reported
Cpe	libxfont-dev	cpe	Not reported	`1:2.0.6-1+deb13u1build0.24.04.2`	Not reported	Not reported	Not reported
Cpe	libxfont2	cpe	Not reported	`1:2.0.6-1+deb13u1build0.24.04.2`	Not reported	Not reported	Not reported
Ubuntu	libxfont	deb	pro	`1:2.0.3-1ubuntu0.20.04.1~esm2`	Not reported	UBUNTU-CVE-2026-56002	Not reported
Ubuntu	libxfont	deb	22.04	`1:2.0.5-1ubuntu0.2`	Not reported	UBUNTU-CVE-2026-56002	Not reported
Ubuntu	libxfont	deb	24.04	`1:2.0.6-1+deb13u1build0.24.04.2`	Not reported	UBUNTU-CVE-2026-56002	Not reported
Ubuntu	libxfont	deb	26.04	`1:2.0.6-2ubuntu0.2`	Not reported	UBUNTU-CVE-2026-56002	Not reported

[Debian bug #1141702]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libxfont2]Affected
Source package: [libxfont]
Details (4)
- 1:2.0.6-1 · amd64 · bookworm
  Affected · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12
- 1:2.0.6-1 · arm64 · bookworm
  Affected · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12
- 1:2.0.6-1+deb12u1 · amd64 · bookworm-security
  Fixed · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12
- 1:2.0.6-1+deb12u1 · arm64 · bookworm-security
  Fixed · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12
[libxfont-dev]Affected
Source package: [libxfont]
Details (4)
- 1:2.0.6-1 · amd64 · bookworm
  Affected · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12
- 1:2.0.6-1 · arm64 · bookworm
  Affected · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12
- 1:2.0.6-1+deb12u1 · amd64 · bookworm-security
  Fixed · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12
- 1:2.0.6-1+deb12u1 · arm64 · bookworm-security
  Fixed · Fixed: 1:2.0.6-1+deb12u1
  nvd · libxfont · debian · bookworm; nvd · libxfont · debian · 12

[Debian 13 (Trixie)]

[libxfont2]Affected
Source package: [libxfont]
Details (4)
- 1:2.0.6-1+b3 · amd64 · trixie
  Affected · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13
- 1:2.0.6-1+b3 · arm64 · trixie
  Affected · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13
- 1:2.0.6-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13
- 1:2.0.6-1+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13
[libxfont-dev]Affected
Source package: [libxfont]
Details (4)
- 1:2.0.6-1+b3 · amd64 · trixie
  Affected · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13
- 1:2.0.6-1+b3 · arm64 · trixie
  Affected · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13
- 1:2.0.6-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13
- 1:2.0.6-1+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:2.0.6-1+deb13u1
  nvd · libxfont · debian · 13

Observed: Oct 24, 2026, 4:29:15 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] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]