Vulnerability · Published Aug 6, 2026 · Assigned by VulnCheck

CVE-2026-43627llama.cpp b1283–b9058 Integer Overflow in llama_batch_init() Function

High 7.8

In plain English

A high-severity integer overflow in llama.cpp from ggml-org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)0.2%top 89.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() function where unchecked multiplications in malloc() calls can wrap past INT32_MAX when computing allocation sizes. Attackers can pass specially crafted parameters to trigger integer overflow, causing heap corruption and potentially achieving arbitrary code execution through subsequent batch operations that write past allocated buffer boundaries.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	llama.cpp	no fix listed	DEBIAN-CVE-2026-43627
Ubuntu:26.04:LTS	llama.cpp	no fix listed	UBUNTU-CVE-2026-43627
Ubuntu:26.10	llama.cpp	no fix listed	UBUNTU-CVE-2026-43627

Affected products (as reported)

Vendor	Product	Versions
ggml-org	llama.cpp	b1283 – through b9058

Weakness: CWE-190, CWE-680 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches mitigation
https://www.vulncheck.com/advisories/llama-cpp-b1283-b9058-integer-overflow-in-llama-batch-init-function third-party-advisory