CVE-2026-116734 flatcc through 0.6.4 Out-of-Bounds Read via verifier check_header
Medium 6.3
Published
Updated
Check this codebase for CVE-2026-116734 and fix it if it is affected.
What it is: CVE-2026-116734 is a medium-severity vulnerability in dvidelabs flatcc, published on 26 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-116734 in the wild and no public exploit code.
Affected product: dvidelabs flatcc. 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-2026-116734/ (Markdown: https://insights.sbomify.com/CVE-2026-116734/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116734?
CVE-2026-116734 is a medium-severity vulnerability in dvidelabs flatcc, published on 26 Oct 2026.
Official description
flatcc through 0.6.4 contains an integer overflow vulnerability in the check_header function of the FlatBuffers verifier because its overflow guard is dead code. On 32-bit builds, attackers can supply a crafted buffer offset that wraps the bounds check, causing an out-of-bounds read before the buffer and crashing the process.
Weakness: CWE-190
Which versions are affected by CVE-2026-116734?
How do I fix CVE-2026-116734?
No fix has been published for CVE-2026-116734 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116734 being exploited?
There is no known exploitation of CVE-2026-116734 in the wild and no public exploit code.
Sources
Also known as GHSA-ch33-r734-vw2g.