CVE catalog

CVE-2026-66038

Severity: High · CVSS 8.7
Published: Jul 24, 2026, 7:39:27 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.24% · Oct 25, 2026

FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability in the LCL/ZLIB video decoder that allows attackers to expose uninitialized heap memory by supplying a valid zlib stream that inflates to fewer bytes than the expected frame size. The zlib_decomp() function in lcldec.c treats short decompression as non-fatal and continues to the RGB24 conversion path, which copies a full frame's worth of rows from the allocation buffer using original frame dimensions, causing uninitialized heap contents including pointer-derived allocator bytes to be copied into the attacker-observable AVFrame output and potentially defeating ASLR in long-lived media processing services.

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	ffmpeg	sid	`7:9.0.2-4`	fixed
Debian	ffmpeg	forky	`7:9.0.2-4`	fixed
Debian	ffmpeg	trixie	`7:7.1.5-0+deb13u1`	vulnerable
Debian	ffmpeg	trixie-security	`7:7.1.5-0+deb13u1`	vulnerable
Debian	ffmpeg	bookworm	`7:5.1.9-0+deb12u1`	vulnerable
Debian	ffmpeg	bookworm-security	`7:5.1.9-0+deb12u1`	vulnerable
Ubuntu	ffmpeg	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	ffmpeg-doc	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavcodec-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavcodec-extra	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavcodec-extra60	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavcodec60	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavdevice-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavdevice60	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavfilter-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavfilter-extra	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavfilter-extra9	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavfilter9	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavformat-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavformat-extra	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavformat-extra60	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavformat60	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavutil-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libavutil58	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libpostproc-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libpostproc57	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libswresample-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libswresample4	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libswscale-dev	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Ubuntu	libswscale7	noble	`7:6.1.1-3ubuntu5+esm11`	fixed
Fedora	ffmpeg	44	`0:8.1.3-1.fc44`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ffmpeg	source	sid	`7:9.0.2-1`	not yet assigned	Not reported	Not reported
Debian	ffmpeg	source	forky	`7:9.0.2-1`	not yet assigned	Not reported	Not reported
Debian	ffmpeg	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	ffmpeg	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Ubuntu	ffmpeg	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	ffmpeg-doc	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavcodec-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavcodec-extra	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavcodec-extra60	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavcodec60	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavdevice-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavdevice60	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavfilter-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavfilter-extra	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavfilter-extra9	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavfilter9	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavformat-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavformat-extra	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavformat-extra60	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavformat60	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavutil-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libavutil58	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libpostproc-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libpostproc57	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libswresample-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libswresample4	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libswscale-dev	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Ubuntu	libswscale7	deb	noble	`7:6.1.1-3ubuntu5+esm11`	Not reported	Not reported	Not reported
Fedora	ffmpeg	rpm	44	`0:8.1.3-1.fc44`	Not reported	FEDORA-2026-3E109A0C85#CVE-2026-66038	Not reported

Notes

[trixie] ffmpeg: Wait until fixed in 7.1.x upstream branch

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[ffmpeg]Affected
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[ffmpeg-doc]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · all · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · all · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · all · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · all · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavcodec59]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavcodec-dev]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavcodec-extra]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavcodec-extra59]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavdevice59]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavdevice-dev]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavfilter8]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavfilter-dev]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavfilter-extra]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavfilter-extra8]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavformat59]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavformat-dev]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavformat-extra]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavformat-extra59]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavutil57]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libavutil-dev]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libpostproc56]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
[libpostproc-dev]Affected
Source package: [ffmpeg]
Details (4)
- 7:5.1.9-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12
- 7:5.1.9-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · ffmpeg · debian · bookworm; nvd · ffmpeg · debian · 12

Next results

Observed: Oct 27, 2026, 7:11:51 AM UTC

References

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