NULL pointer dereference in Ggml Llama.cpp
CVE-2026-70639
llama.cpp builds b1886 through b7445 contain a null pointer dereference vulnerability in the LLaMA-Android JNI wrapper where the bench_1model() function fails to validate the model context pointer before dereferencing it. Attackers can supply a malicious, corrupt, or truncated model file to trigger a null context condition, causing a SIGSEGV crash that terminates the Android application process and results in denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Ggml Llama.cpp
- Ggml-Org Llama.cpp — versions b1886, 0.9.0, 5c0d18881e0e9794c96b2602736b758bac9d9388
Weakness classification (CWE)
References
- github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches (related, Patch, Third Party Advisory)
- github.com/ggml-org/llama.cpp/commit/5c0d18881e0e9794c96b2602736b758bac9d9388 (Patch, patch)
- github.com/ggml-org/llama.cpp/releases/tag/b7446 (release-notes, Patch, Release Notes, Vendor Advisory)
- www.vulncheck.com/advisories/llama-cpp-b1886-b7445-null-pointer-dereference-dos… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-70639?
- CVE-2026-70639 is a medium-severity vulnerability in Ggml Llama.cpp, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2026-08-06.
- How severe is CVE-2026-70639?
- Medium severity. CVSS v3 base score is 5.5 out of 10.