CVE-2026-121602
CVE-2026-121602
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- github.com/solanum-ircd/solanum/pull/551 (issue-tracking, patch)
- github.com/solanum-ircd/solanum/commit/2ce64debf65e9710e9eea099ada93dbf6655b5ff (patch)
- github.com/solanum-ircd/solanum/blob/2ea1382e4262b212a91034258c466f0f6754cd61/m… (technical-description)
- github.com/solanum-ircd/solanum/blob/2ea1382e4262b212a91034258c466f0f6754cd61/i… (technical-description)
- github.com/solanum-ircd/solanum (product)
- www.vulncheck.com/advisories/solanum-before-commit-2ce64de-heap-buffer-overflow… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121602?
- CVE-2026-121602 is a medium-severity vulnerability, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-11-03.
- How severe is CVE-2026-121602?
- Medium severity. CVSS v3 base score is 6.5 out of 10.