CVE-2026-70638
llama.cpp b1886–b7445 Integer Overflow via new_1batch() in llama-android.cpp
HIGH 8.5EPSS 0.2%
llama.cpp builds b1886 through b7445 contain an integer overflow vulnerability in the LLaMA-Android JNI wrapper where the new_1batch() function multiplies sizeof(llama_seq_id) by an attacker-controlled n_seq_max parameter without overflow validation, causing heap buffer allocation to wrap and allocate insufficient memory. Attackers can exploit this by providing a crafted n_seq_max value through a malicious model file or JNI call to trigger heap corruption and achieve denial of service or arbitrary code execution on Android applications using the LLaMA-Android binding.
- Affected
- ggml-org · llama.cpp
- CVSS v4.0 VULNCHECK
- 8.5 HIGH
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 VULNCHECK
- 7.8 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS
- 0.23% chance of exploitation in the next 30 days, 13th percentile
- Published
- 2026-08-06
- Updated
- 2026-08-14
Proof-of-concept exploits (1)
- Hunt-Benito/one-multiply-too-many-cve-2026-70638-llama-cpp-android-jni-integer-overflow0★ · 2026-08-07
Security advisories
- ggml-org/llama.cpp/releases/tag/b7446
- Vladimir-tokarev-cyera/llama-cpp-security-patches
- https://www.vulncheck.com/advisories/llama-cpp-b1886-b7445-integer-overflow-via-new-1batc…