---
id: CVE-2026-116816
title: llama.cpp b5899 before b10261 Heap Out-of-Bounds Write via plamo2 Tokenizer
summary: >-
  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> w…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-129
vendor: ggml-org
product: llama.cpp
affected:
  - llama.cpp >= b5899 < b10261
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T00:33:58.581Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116816'
references:
  - url: 'https://github.com/ggml-org/llama.cpp/pull/25969'
  - url: 'https://github.com/ggml-org/llama.cpp/pull/26511'
  - url: >-
      https://github.com/ggml-org/llama.cpp/commit/cf06ad7dfe79e7bf2934150d4fefe1ce8db05490
  - url: >-
      https://github.com/ggml-org/llama.cpp/blob/b10259/src/llama-vocab.cpp#L1376-L1377
  - url: 'https://github.com/ggml-org/llama.cpp/releases/tag/b10261'
    label: llama.cpp b10261 Release Notes
  - url: >-
      https://www.vulncheck.com/advisories/llama-cpp-b5899-before-b10261-heap-out-of-bounds-write-via-plamo2-tokenizer
    label: >-
      VulnCheck Advisory: llama.cpp b5899 before b10261 Heap Out-of-Bounds Write
      via plamo2 Tokenizer
tags:
  - cve.org
epss: 0.00135
epssPercentile: 0.02925
ingestedAt: '2026-10-27T16:11:59.179Z'
---

## Overview

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.

## Affected

- `llama.cpp >= b5899 < b10261`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.