{"affected":[{"defaultStatus":"unknown","product":"Cobalt","source":"CNA: zdi","vendor":"Ashlar-Vellum","versions":[{"status":"affected","version":"1204.209"}]}],"cveId":"CVE-2026-121743","cwes":["CWE-122"],"description":"Ashlar-Vellum Cobalt AR File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.\n\nThe specific flaw exists within the parsing of AR files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28675.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.8,"severity":"high","source":"CNA: zdi","vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.0"}],"modifiedAt":1794451872304,"publishedAt":1794451872304,"references":[{"source":"CNA: zdi","tags":["x_research-advisory"],"url":"https://www.zerodayinitiative.com/advisories/ZDI-26-873/"}],"remediation":[],"revision":"77ce9b37aabbb0a9fb4480b3863d4b3165c430c67e1d8bd8966c4b9bc9b86620","sources":[{"modifiedAt":1794451872304,"name":"CNA: zdi","retrievedAt":1794452942439,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121743"}],"ssvc":null,"status":"published","title":"Ashlar-Vellum Cobalt AR File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability","updatedAt":1794452942439}