CVE catalog

CVE-2026-53525

weechat: CVE-2026-53525

Severity: High · CVSS 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Aug 9, 2026, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.43% · Oct 25, 2026

WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	weechat	sid	`4.10.0-1`	fixed
Debian	weechat	forky	`4.10.0-1`	fixed
Debian	weechat	trixie	`4.6.3-1`	vulnerable
Debian	weechat	bookworm	`3.8-1`	vulnerable
Ubuntu	weechat	pro	`2.6-2`	vulnerable
Ubuntu	weechat	pro	`2.6-2build1`	vulnerable
Ubuntu	weechat	pro	`2.6-2build2`	vulnerable
Ubuntu	weechat	pro	`2.6-2ubuntu1`	vulnerable
Ubuntu	weechat	pro	`2.6-2ubuntu2`	vulnerable
Ubuntu	weechat	pro	`2.8-1`	vulnerable
Ubuntu	weechat	pro	`2.8-1ubuntu0.1~esm1`	vulnerable
Ubuntu	weechat	22.04	`3.3-1`	vulnerable
Ubuntu	weechat	22.04	`3.3-1ubuntu1`	vulnerable
Ubuntu	weechat	22.04	`3.4-2`	vulnerable
Ubuntu	weechat	22.04	`3.4-2build1`	vulnerable
Ubuntu	weechat	22.04	`3.4-2build2`	vulnerable
Ubuntu	weechat	22.04	`3.4.1-1`	vulnerable
Ubuntu	weechat	22.04	`3.5-1`	vulnerable
Ubuntu	weechat	24.04	`4.0.5-1`	vulnerable
Ubuntu	weechat	24.04	`4.1.1-1`	vulnerable
Ubuntu	weechat	24.04	`4.1.1-1build2`	vulnerable
Ubuntu	weechat	24.04	`4.1.1-1build3`	vulnerable
Ubuntu	weechat	24.04	`4.1.1-1build6`	vulnerable
Ubuntu	weechat	24.04	`4.1.1-1build7`	vulnerable
Ubuntu	weechat	26.04	`4.6.3-1build1`	vulnerable
Ubuntu	weechat	26.04	`4.7.2-1`	vulnerable
Ubuntu	weechat	26.04	`4.8.1-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	weechat	source	sid	`4.9.3-1`	not yet assigned	Not reported	Not reported
Debian	weechat	source	forky	`4.9.3-1`	not yet assigned	Not reported	Not reported
Debian	weechat	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	weechat	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[weechat]Affected
Details (4)
- 3.8-1 · all · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · all · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-core]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-curses]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-dev]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-doc]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · all · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · all · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-guile]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-headless]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-lua]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-perl]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-php]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-plugins]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-python]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-ruby]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
[weechat-tcl]Affected
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 3.8-1 · arm64 · bookworm
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · weechat · debian · bookworm

Observed: Oct 23, 2026, 9:42:29 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]