---
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'
---

## Overview

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.

## Affected

- `solanum < 2ce64debf65e9710e9eea099ada93dbf6655b5ff`

## Remediation

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