---
id: CVE-2026-43629
title: >-
  llama.cpp builds b4882 through b9058 contain a heap buffer overflow
  vulnerability in the KV cache state restore path where the state_read_data()
  function computes write size without overflow checking, allowing attackers
  with write access…
summary: >-
  llama.cpp builds b4882 through b9058 contain a heap buffer overflow
  vulnerability in the KV cache state restore path where the state_read_data()
  function computes write size without overflow checking, allowing attackers
  with write access…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
  - CWE-787
vendor: ggml
product: llama.cpp
affected:
  - 'llama.cpp >= b4882, <= b9058'
published: '2026-08-06'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T18:11:47.567'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-43629'
references:
  - url: 'https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/llama-cpp-b4882-b9058-buffer-overflow-in-kv-cache-state-restore
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00698
epssPercentile: 0.51003
ingestedAt: '2026-09-21T18:50:57.544Z'
---

## Overview

llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restore path where the state_read_data() function computes write size without overflow checking, allowing attackers with write access to the slot_save_path directory to corrupt heap memory. Attackers can craft malicious state files where cell_count multiplication overflows or exceeds tensor buffer allocation to write attacker-controlled bytes past buffer boundaries, potentially resulting in heap metadata corruption, model weight corruption, or arbitrary code execution via function pointer overwrite.

## Affected

- `llama.cpp >= b4882, <= b9058`

## Remediation

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