Buffer overflow in Ggml Llama.cpp
CVE-2026-43629
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Ggml Llama.cpp
- Ggml-Org Llama.cpp — versions b4882, 0.16.1
Weakness classification (CWE)
References
- github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches (Patch, Third Party Advisory, mitigation)
- www.vulncheck.com/advisories/llama-cpp-b4882-b9058-buffer-overflow-in-kv-cache-… (Patch, Third Party Advisory, Mitigation, third-party-advisory)
Frequently asked questions
- What is CVE-2026-43629?
- CVE-2026-43629 is a high-severity vulnerability in Ggml Llama.cpp, classified under Integer Overflow or Wraparound. CVSS score: 8.1/10. Published 2026-08-06.
- How severe is CVE-2026-43629?
- High severity. CVSS v3 base score is 8.1 out of 10.