OSV-2026-699 Use-of-uninitialized-value in Mat_VarGetSize
Not scored
Published
Check this codebase for OSV-2026-699 and fix it if it is affected.
What it is: OSV-2026-699 is a vulnerability in matio, published on 8 May 2026.
Exploitation: There is no known exploitation of OSV-2026-699 in the wild and no public exploit code.
Affected packages and fixed versions:
- matio (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-2026-699/ (Markdown: https://insights.sbomify.com/OSV-2026-699/index.md)
A use-of-uninitialized-value bug in Mat_VarGetSize can cause a crash when processing malformed MATLAB files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2026-699?
OSV-2026-699 is a vulnerability in matio, published on 8 May 2026.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=510360595
Crash type: Use-of-uninitialized-value
Crash state:
Mat_VarGetSize
MatioRead
matio_fuzzer.cpp
Which versions are affected by OSV-2026-699?
1 open source package ship an affected version, including matio.
| Package | Affected | Fixed in |
|---|---|---|
matio OSS-Fuzz | All versions | None |
How do I fix OSV-2026-699?
No fix has been published for OSV-2026-699 yet. Limit exposure of the affected software until one is available.
Is OSV-2026-699 being exploited?
There is no known exploitation of OSV-2026-699 in the wild and no public exploit code.