Ashlar-Vellum Cobalt AR File Parser heap-based overflow

Summaryinfo

A vulnerability classified as critical was found in Ashlar-Vellum Cobalt. Affected by this issue is some unknown functionality of the component AR File Parser. Such manipulation leads to heap-based overflow. This vulnerability is uniquely identified as CVE-2026-121743. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Ashlar-Vellum Cobalt (version unknown). Affected by this issue is an unknown function of the component AR File Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to 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(). Impacted is confidentiality, integrity, and availability.

This vulnerability is handled as CVE-2026-121743. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/04/2026).

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

• Ashlar-Vellum

Name

• Cobalt

License

• commercial

CPE 2.3info

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CPE 2.2info

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Entryinfo

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