{"id":"CVE-2026-19781","state":"PUBLISHED","title":"Ashlar-Vellum Cobalt VS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability","description":"Ashlar-Vellum Cobalt VS 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 VS 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-28173.","publishedAt":"2026-09-15T18:04:05.436Z","updatedAt":"2026-09-15T19:22:47.932Z","severity":{"score":7.8,"label":"High","version":"3.0","vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"zdi"},"assigner":"zdi","products":["Ashlar-Vellum Cobalt"],"affected":[{"vendor":"Ashlar-Vellum","product":"Cobalt","defaultStatus":"unknown","versions":[{"version":"1204.204","status":"affected"}]}],"references":["https://www.zerodayinitiative.com/advisories/ZDI-26-587/"],"weaknesses":["CWE-122"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/19xxx/CVE-2026-19781.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-19781","state":"PUBLISHED","datePublished":"2026-09-15T18:04:05.436Z","dateUpdated":"2026-09-15T19:22:47.932Z","assignerShortName":"zdi","assignerOrgId":"99f1926a-a320-47d8-bbb5-42feb611262e","dateReserved":"2026-08-13T17:43:39.304Z"},"containers":{"cna":{"title":"Ashlar-Vellum Cobalt VS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability","descriptions":[{"lang":"en","value":"Ashlar-Vellum Cobalt VS 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 VS 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-28173."}],"affected":[{"vendor":"Ashlar-Vellum","product":"Cobalt","defaultStatus":"unknown","versions":[{"version":"1204.204","status":"affected"}]}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-26-587/","name":"ZDI-26-587","tags":["x_research-advisory"]}],"metrics":[{"format":"CVSS","cvssV3_0":{"version":"3.0","vectorString":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122: Heap-based Buffer Overflow","type":"CWE"}]}],"providerMetadata":{"shortName":"zdi","orgId":"99f1926a-a320-47d8-bbb5-42feb611262e","dateUpdated":"2026-09-15T18:04:05.436Z"},"dateAssigned":"2026-08-13T17:43:39.341Z","datePublic":"2026-08-24T21:13:44.187Z","source":{"lang":"en","value":"Rocco Calvi (@TecR0c) with TecSecurity"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T19:22:40.278547Z","id":"CVE-2026-19781","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T19:22:47.932Z"}}]}}}