OSV-2025-809 Use-of-uninitialized-value in WebPCleanupTransparentArea
Not scored
Published
Check this codebase for OSV-2025-809 and fix it if it is affected.
What it is: OSV-2025-809 is a memory corruption vulnerability in libwebp, published on 5 Oct 2025.
Exploitation: There is no known exploitation of OSV-2025-809 in the wild and no public exploit code.
Affected packages and fixed versions:
- libwebp (OSS-Fuzz): affected all versions; no fix listed
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/OSV-2025-809/ (Markdown: https://insights.sbomify.com/OSV-2025-809/index.md)
Use of uninitialized value in WebP cleanup function can cause crashes, affecting applications using the WebP library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2025-809?
OSV-2025-809 is a memory corruption vulnerability in libwebp, published on 5 Oct 2025.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=449246999
Crash type: Use-of-uninitialized-value
Crash state:
WebPCleanupTransparentArea
WebPEncode
EncTest
Which versions are affected by OSV-2025-809?
1 open source package ship an affected version, including libwebp.
| Package | Affected | Fixed in |
|---|---|---|
libwebp OSS-Fuzz | All versions | None |
How do I fix OSV-2025-809?
No fix has been published for OSV-2025-809 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2025-809 being exploited?
There is no known exploitation of OSV-2025-809 in the wild and no public exploit code.