OSV-2026-846 Bad-cast to AMFColor from AMFMetadata
Not scored
Published
Check this codebase for OSV-2026-846 and fix it if it is affected.
What it is: OSV-2026-846 is a memory corruption vulnerability in assimp, published on 4 Jun 2026.
Exploitation: There is no known exploitation of OSV-2026-846 in the wild and no public exploit code.
Affected packages and fixed versions:
- assimp (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-2026-846/ (Markdown: https://insights.sbomify.com/OSV-2026-846/index.md)
A bad-cast vulnerability in the Assimp library allows attackers to cause a denial of service via crafted AMF files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is OSV-2026-846?
OSV-2026-846 is a memory corruption vulnerability in assimp, published on 4 Jun 2026.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=519360629
Crash type: Bad-cast
Crash state:
Bad-cast to AMFColor from AMFMetadata
Assimp::AMFImporter::SPP_Material::GetColor
Assimp::AMFImporter::Postprocess_BuildMeshSet
Which versions are affected by OSV-2026-846?
1 open source package ship an affected version, including assimp.
| Package | Affected | Fixed in |
|---|---|---|
assimp OSS-Fuzz | All versions | None |
How do I fix OSV-2026-846?
No fix has been published for OSV-2026-846 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-2026-846 being exploited?
There is no known exploitation of OSV-2026-846 in the wild and no public exploit code.