{"id":"CVE-2026-121602","title":"Solanum before commit 2ce64de Heap Buffer Overflow via JOIN and SJOIN","summary":"Solanum before commit 2ce64de contains a heap-based buffer overflow vulnerability that allows a malicious linked server to corrupt memory by sending overlong channel names in JOIN or SJOIN messages. Attackers controlling a peer server ca…","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-122"],"vendor":"solanum-ircd","product":"solanum","affected":["solanum < 2ce64debf65e9710e9eea099ada93dbf6655b5ff"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-11-03T17:47:30.495862Z"},"published":"2026-11-03","updated":"2026-11-03","sourceUpdated":"2026-11-03T18:08:37.511Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121602","references":[{"url":"https://github.com/solanum-ircd/solanum/pull/551"},{"url":"https://github.com/solanum-ircd/solanum/commit/2ce64debf65e9710e9eea099ada93dbf6655b5ff"},{"url":"https://github.com/solanum-ircd/solanum/blob/2ea1382e4262b212a91034258c466f0f6754cd61/modules/core/m_join.c#L507"},{"url":"https://github.com/solanum-ircd/solanum/blob/2ea1382e4262b212a91034258c466f0f6754cd61/ircd/channel.c#L371-L385"},{"url":"https://github.com/solanum-ircd/solanum"},{"url":"https://www.vulncheck.com/advisories/solanum-before-commit-2ce64de-heap-buffer-overflow-via-join-and-sjoin","label":"VulnCheck Advisory: Solanum before commit 2ce64de Heap Buffer Overflow via JOIN and SJOIN"}],"tags":["cve.org"],"epss":0.00836,"epssPercentile":0.57943,"ingestedAt":"2026-11-05T20:33:06.337Z","slug":"CVE-2026-121602","body":"## Overview\n\nSolanum before commit 2ce64de contains a heap-based buffer overflow vulnerability that allows a malicious linked server to corrupt memory by sending overlong channel names in JOIN or SJOIN messages. Attackers controlling a peer server can trigger strcpy and sprintf overflows in ms_join and ms_sjoin to crash the ircd or potentially achieve remote code execution.\n\n## Affected\n\n- `solanum < 2ce64debf65e9710e9eea099ada93dbf6655b5ff`\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":[]}