{"id":"CVE-2026-121603","title":"Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL Handler","summary":"Solanum before commit 2ea1382 contains a buffer overflow vulnerability in ms_kill() that allows malicious linked servers to corrupt memory by sending an overlong kill reason. Attackers controlling a rogue or compromised peer server can s…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-120"],"vendor":"solanum-ircd","product":"solanum","affected":["solanum < 2ea1382e4262b212a91034258c466f0f6754cd61"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-11-03T17:15:57.210109Z"},"published":"2026-11-03","updated":"2026-11-03","sourceUpdated":"2026-11-03T17:17:13.585Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121603","references":[{"url":"https://github.com/solanum-ircd/solanum/pull/550"},{"url":"https://github.com/solanum-ircd/solanum/commit/2ea1382e4262b212a91034258c466f0f6754cd61"},{"url":"https://github.com/solanum-ircd/solanum/blob/7bc7e34c04711247b932666e19ae900cba884540/modules/core/m_kill.c#L277"},{"url":"https://github.com/solanum-ircd/solanum"},{"url":"https://www.vulncheck.com/advisories/solanum-before-commit-2ea1382-buffer-overflow-via-server-to-server-kill-handler","label":"VulnCheck Advisory: Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL Handler"}],"tags":["cve.org"],"epss":0.00764,"epssPercentile":0.5566,"ingestedAt":"2026-11-05T20:33:06.310Z","slug":"CVE-2026-121603","body":"## Overview\n\nSolanum before commit 2ea1382 contains a buffer overflow vulnerability in ms_kill() that allows malicious linked servers to corrupt memory by sending an overlong kill reason. Attackers controlling a rogue or compromised peer server can send a reason exceeding KILLLEN that overflows a static 512-byte buffer, crashing the ircd or potentially achieving remote code execution.\n\n## Affected\n\n- `solanum < 2ea1382e4262b212a91034258c466f0f6754cd61`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}