FFmpeg 7.0 before 8.1.3 and 9.x before 9.0.2 Heap Overflow via vulkan_av1.c
FFmpeg 7.0 through 8.1.2, and 9.0 before 9.0.2, are affected when AV1 streams with more than 256 tiles are decoded via Vulkan. Fixed in 8.1.3 and 9.0.2.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 8.1.3, 9.0.2
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affects FFmpeg 7.0 up to before 8.1.3, and 9.x before 9.0.2 Stream is decoded via the Vulkan hardware accelerator Crafted AV1 stream contains more than 256 tiles
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 12/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
FFmpeg 7.0 before 8.1.3 and 9.x before 9.0.2 contains a heap out-of-bounds write vulnerability in vk_av1_decode_slice() in libavcodec/vulkan_av1.c because the tile-count limit is checked only on entry. Attackers can supply a crafted AV1 stream with more than 256 tiles decoded via the Vulkan hardware accelerator to overflow tile_sizes and corrupt heap memory.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure5/25Specific setups only
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.3/10CVSS 7.3
- No patch0/5No signal
What would change the score
- Would score about 62 if added to CISA KEV
- Would score about 57 if CISA's SSVC rates exploitation active
- Would score about 22 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
Affects FFmpeg 7.0 up to before 8.1.3, and 9.x before 9.0.2 Stream is decoded via the Vulkan hardware accelerator Crafted AV1 stream contains more than 256 tilesUpgrade to a fixed version: 8.1.3, 9.0.2.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- FFmpeg FFmpeg
From 7.0 · fixed in 8.1.3; From 9.0 · fixed in 9.0.2
Evidence 5
- Patch
- Report
- Repository
- Repository
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-125201
Is CVE-2026-125201 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A crafted AV1 stream with more than 256 tiles, decoded through the Vulkan hardware accelerator, causes an out-of-bounds write on the heap. The write overflows tile_sizes and corrupts heap memory.Source: vulncheck.com
Which versions are affected by CVE-2026-125201?
FFmpeg: from 7.0 before 8.1.3; from 9.0 before 9.0.2.Source: cve.now feed data
Am I affected, and how do I check?
Affects FFmpeg 7.0 up to before 8.1.3, and 9.x before 9.0.2. The bug needs Vulkan hardware-accelerated decoding of an AV1 stream with more than 256 tiles, so check the version with ffmpeg -version and whether Vulkan decoding is enabled in the setup that runs it.Source: vulncheck.com
How do I fix CVE-2026-125201?
Upgrade to FFmpeg 8.1.3 or later on the 8.x line, or to 9.0.2 or later on the 9.x line.Source: vulncheck.com