Vulnerability in Ggml-Org Llama.cpp
CVE-2026-116816
llama.cpp b5899 before b10261 contains a heap out-of-bounds write vulnerability in llm_tokenizer_plamo2::build that allows attackers to corrupt heap memory via crafted GGUF models. Attackers can supply BYTE-typed token text like <0x-1> whose negative parsed value writes token ids before the bytes_ buffer during model loading, causing crashes or potential code execution.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (2.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/ggml-org/llama.cpp/blob/b10259/src/llama-vocab.cpp (technical-description)
- github.com/ggml-org/llama.cpp/commit/cf06ad7dfe79e7bf2934150d4fefe1ce8db05490 (patch)
- github.com/ggml-org/llama.cpp/pull/25969 (issue-tracking, patch)
- github.com/ggml-org/llama.cpp/pull/26511 (issue-tracking, patch)
- github.com/ggml-org/llama.cpp/releases/tag/b10261 (release-notes)
- www.vulncheck.com/advisories/llama-cpp-b5899-before-b10261-heap-out-of-bounds-w… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116816?
- CVE-2026-116816 is a high-severity vulnerability in Ggml-Org Llama.cpp, classified under Improper Validation of Array Index. CVSS score: 7.8/10. Published 2026-10-27.
- How severe is CVE-2026-116816?
- High severity. CVSS v3 base score is 7.8 out of 10.