# CVE-2026-70638: llama.cpp builds b1886 through b7445 contain an integer overflow vulnerability in the LLaMA-Android JNI wrapper where…

Source: https://junglewise.ai/threats/cve-2026-70638-llama-cpp-builds-b1886-through-b7445-contain-an-integer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-06  
License: CC BY 4.0 with a link back

CVE-2026-70638 · Severity: high · CVSS 7.8 · Published 2026-08-06

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.

Technologies: [GGML Llama.Cpp](https://junglewise.ai/threats/technologies/llama-cpp). Vendors: [GGML](https://junglewise.ai/threats/vendors/ggml).

## Quick answers

**Is CVE-2026-70638 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70638 being exploited in the wild.

**How severe is CVE-2026-70638?** High severity, with a CVSS score of 7.8, published 6 August 2026.

**Which products and versions are affected?** GGML Llama.Cpp. The advisory does not name versions.

**Is there a fix for CVE-2026-70638?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-70638?** Check whether you run GGML Llama.Cpp. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- GGML Llama.Cpp

## Related threats

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- [llama.cpp denial of service via negative top_n in reranking API](https://junglewise.ai/threats/cve-2026-52132-llama-cpp-denial-of-service-via-negative-top-n-in-reranking-api)
- [llama.cpp uncontrolled recursion denial of service in json-schema-to-grammar](https://junglewise.ai/threats/cve-2026-52131-llama-cpp-uncontrolled-recursion-denial-of-service-in-json-schema)
- [llama.cpp uncontrolled recursion in JSON schema converter](https://junglewise.ai/threats/cve-2026-52130-llama-cpp-uncontrolled-recursion-in-json-schema-converter)
- [llama.cpp builds b1886 through b7445 contain a race condition use-after-free vulnerability in the LLaMA-Android JNI…](https://junglewise.ai/threats/cve-2026-70640-llama-cpp-builds-b1886-through-b7445-contain-a-race-condition-use)