CVE catalog

CVE-2020-11721

libsixel: CVE-2020-11721

Severity: Medium
Published: Apr 12, 2020, 7:15:10 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.94% · Oct 27, 2026

load_png in loader.c in libsixel.a in libsixel 1.8.6 has an uninitialized pointer leading to an invalid call to free, which can cause a denial of service.

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	libsixel	sid	`1:1.8.7-r2-1`	fixed
Debian	libsixel	forky	`1:1.8.7-r2-1`	fixed
Debian	libsixel	trixie	`1.10.5-1`	fixed
Debian	libsixel	bookworm	`1.10.3-3`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libsixel	source	sid	`1.10.3-1`	low	Not reported	[972641]
Debian	libsixel	source	forky	`1.10.3-1`	low	Not reported	[972641]
Debian	libsixel	source	trixie	`1.10.3-1`	low	Not reported	[972641]
Debian	libsixel	source	bookworm	`1.10.3-1`	low	Not reported	[972641]

[Debian bug #972641]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libsixel1]Fixed
Source package: [libsixel]
Details (2)
- 1.10.3-3 · amd64 · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
- 1.10.3-3 · arm64 · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
[libsixel-bin]Fixed
Source package: [libsixel]
Details (2)
- 1.10.3-3 · amd64 · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
- 1.10.3-3 · arm64 · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
[libsixel-dev]Fixed
Source package: [libsixel]
Details (2)
- 1.10.3-3 · amd64 · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
- 1.10.3-3 · arm64 · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
[libsixel-examples]Fixed
Source package: [libsixel]
Details (2)
- 1.10.3-3 · all · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12
- 1.10.3-3 · all · bookworm
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · bookworm; dsa · libsixel · debian · 12

[Debian 13 (Trixie)]

[libsixel1]Fixed
Source package: [libsixel]
Details (2)
- 1.10.5-1 · amd64 · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13
- 1.10.5-1 · arm64 · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13
[libsixel-bin]Fixed
Source package: [libsixel]
Details (2)
- 1.10.5-1 · amd64 · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13
- 1.10.5-1 · arm64 · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13
[libsixel-dev]Fixed
Source package: [libsixel]
Details (2)
- 1.10.5-1 · amd64 · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13
- 1.10.5-1 · arm64 · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13
[libsixel-examples]Fixed
Source package: [libsixel]
Details (2)
- 1.10.5-1 · all · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13
- 1.10.5-1 · all · trixie
  Fixed · Fixed: 1.10.3-1
  dsa · libsixel · debian · 13

Observed: Oct 23, 2026, 5:46:57 PM UTC

References

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