| Component | llama.cpp |
| Severity | high (CVSS 7.8) |
| CVSS vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Published (NVD) | 2026-10-27 |
| Last modified | 2026-10-31 |
| Affected versions | >= b5899, < b10261 from the CVE Program record written by the CNA that assigned the CVE |
| Fixed in | b10261 |
| Weakness | CWE-129 |
| CISA KEV | not listed |
Versions, checked against NVD
NVD's record (status: Awaiting Analysis) lists no affected versions of llama.cpp for this CVE. The ranges above come from the CVE record written by VulnCheck, the CNA that assigned the CVE.
NVD description
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.
What to do
- Upgrade llama.cpp to
b10261or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-116816
- https://github.com/ggml-org/llama.cpp/blob/b10259/src/llama-vocab.cpp#L1376-L1377
- https://github.com/ggml-org/llama.cpp/commit/cf06ad7dfe79e7bf2934150d4fefe1ce8db05490
- https://github.com/ggml-org/llama.cpp/pull/25969
- https://github.com/ggml-org/llama.cpp/pull/26511
- https://github.com/ggml-org/llama.cpp/releases/tag/b10261
- https://www.vulncheck.com/advisories/llama-cpp-b5899-before-b10261-heap-out-of-bounds-write-via-plamo2-tokenizer