ggml-org llama.cpp up to 0.17.1/b9058 llama_batch_init integer overflow

Summaryinfo

A vulnerability marked as critical has been reported in ggml-org llama.cpp up to 0.17.1/b9058. Affected is the function llama_batch_init. This manipulation causes integer overflow. This vulnerability appears as CVE-2026-43627. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in ggml-org llama.cpp up to 0.17.1/b9058. Affected by this vulnerability is the function llama_batch_init. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-43627 since 05/01/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/07/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• ggml-org

Name

• llama.cpp

Version

• 0.17.0
• 0.17.1
• b9058

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CPE 2.2info

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