---
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'
---

## Overview

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

- `solanum < 2ea1382e4262b212a91034258c466f0f6754cd61`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.