CVE catalog

CVE-2021-46700

libsixel: CVE-2021-46700

Severity: Medium
Published: Feb 19, 2022, 7:15:10 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.95% · Oct 25, 2026

In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.

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

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libsixel	source	sid	`(unfixed)`	not yet assigned	Not reported	[1014469]
Debian	libsixel	source	forky	`(unfixed)`	not yet assigned	Not reported	[1014469]
Debian	libsixel	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1014469]
Debian	libsixel	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1014469]

[Debian bug #1014469]

Notes

[trixie] libsixel: Minor issue, revisit when fixed upstream [bookworm] libsixel: Minor issue, revisit when fixed upstream

OpenFactory catalog packages

[Debian 12 (Bookworm)]

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

[Debian 13 (Trixie)]

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

Observed: Oct 23, 2026, 6:04:11 PM UTC

References

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