ggml-org llama.cpp up to b9058 KV Cache State Restore state_read_data heap-based overflow

Summaryinfo

A vulnerability classified as problematic was found in ggml-org llama.cpp up to b9058. This affects the function state_read_data of the component KV Cache State Restore. Executing a manipulation can lead to heap-based overflow. This vulnerability is handled as CVE-2026-43629. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability has been found in ggml-org llama.cpp up to b9058 and classified as problematic. This vulnerability affects the function state_read_data of the component KV Cache State Restore. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restore path where the state_read_data() function computes write size without overflow checking, allowing attackers with write access to the slot_save_path directory to corrupt heap memory. Attackers can craft malicious state files where cell_count multiplication overflows or exceeds tensor buffer allocation to write attacker-controlled bytes past buffer boundaries, potentially resulting in heap metadata corruption, model weight corruption, or arbitrary code execution via function pointer overwrite.

The advisory is available at github.com. This vulnerability was named CVE-2026-43629 since 05/01/2026. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of 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

• b9058

CPE 2.3info

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CPE 2.2info

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