CVE-2026-125204 FFmpeg through 9.0.2 Heap Buffer Overflow in libwebp Encoder Conditional Replenishment
High 7.3
Published
Updated
Check this codebase for CVE-2026-125204 and fix it if it is affected.
What it is: CVE-2026-125204 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-125204 in the wild and no public exploit code.
Affected product: FFmpeg. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-125204/ (Markdown: https://insights.sbomify.com/CVE-2026-125204/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-125204?
CVE-2026-125204 is a high-severity vulnerability in FFmpeg, published on 9 Nov 2026.
Official description
FFmpeg through 9.0.2 contains a heap buffer overflow in ff_libwebp_get_frame() in libwebpenc_common.c that lets attackers corrupt memory when cr_threshold is set. Attackers can supply crafted media that increases resolution mid-stream, causing memcpy() to write pixel data past the stale reference frame and crash applications.
Weakness: CWE-122
Which versions are affected by CVE-2026-125204?
How do I fix CVE-2026-125204?
No fix has been published for CVE-2026-125204 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-125204 being exploited?
There is no known exploitation of CVE-2026-125204 in the wild and no public exploit code.
Sources
Also known as GHSA-44g2-w5qj-hv47, UBUNTU-CVE-2026-125204.