Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121603Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL Handler

Medium 6.5

In plain English

A medium-severity buffer overflow in solanum from solanum-ircd. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.8%top 44.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 send a reason exceeding KILLLEN that overflows a static 512-byte buffer, crashing the ircd or potentially achieving remote code execution.

Affected products (as reported)

Vendor	Product	Versions
solanum-ircd	solanum	0 – before 2ea1382e4262b212a91034258c466f0f6754cd61

Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/solanum-ircd/solanum/pull/550 issue-tracking, patch
https://github.com/solanum-ircd/solanum/commit/2ea1382e4262b212a91034258c466f0f6754cd61 patch
https://github.com/solanum-ircd/solanum/blob/7bc7e34c04711247b932666e19ae900cba884540/modules/core/m_kill.c#L277 technical-description
https://github.com/solanum-ircd/solanum product
VulnCheck Advisory: Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL Handler third-party-advisory