CVE-2026-116840 llama.cpp b5854 before b11275 Integer Overflow in gguf_init_from_reader
Medium 6.9
Published
Updated
Check this codebase for CVE-2026-116840 and fix it if it is affected.
What it is: CVE-2026-116840 is a medium-severity vulnerability in ggml-org llama.cpp, published on 27 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-116840 in the wild and no public exploit code.
Affected product: ggml-org llama.cpp. 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-2026-116840/ (Markdown: https://insights.sbomify.com/CVE-2026-116840/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-116840?
CVE-2026-116840 is a medium-severity vulnerability in ggml-org llama.cpp, published on 27 Oct 2026.
Official description
llama.cpp b5854 before b11275 contains an integer overflow vulnerability in gguf_init_from_reader that bypasses the CVE-2025-53630 size check when padding near-SIZE_MAX tensor sizes. Attackers can supply a crafted GGUF file whose tensor size pads to zero, causing an undersized data blob and out-of-bounds reads by consumers.
Weakness: CWE-190
Which versions are affected by CVE-2026-116840?
How do I fix CVE-2026-116840?
Upgrade to a fixed version.
Is CVE-2026-116840 being exploited?
There is no known exploitation of CVE-2026-116840 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-116840, GHSA-52pf-v9gp-98qj, UBUNTU-CVE-2026-116840.