CVE-2026-121602 PUBLISHED

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 can trigger strcpy and sprintf overflows in ms_join and ms_sjoin to crash the ircd or potentially achieve remote code execution.

• Tristan Madani (Talence Security) finder
• aaronmdjones remediation developer

• https://github.com/solanum-ircd/solanum/pull/551
• https://github.com/solanum-ircd/solanum/commit/2ce64debf65e9710e9eea099ada93dbf6655b5ff
• https://github.com/solanum-ircd/solanum/blob/2ea1382e4262b212a91034258c466f0f6754cd61/modules/core/m_join.c#L507
• https://github.com/solanum-ircd/solanum/blob/2ea1382e4262b212a91034258c466f0f6754cd61/ircd/channel.c#L371-L385
• https://github.com/solanum-ircd/solanum
• VulnCheck Advisory: Solanum before commit 2ce64de Heap Buffer Overflow via JOIN and SJOIN

• Heap-based Buffer Overflow CWE