CVE catalog

CVE-2026-53524

weechat affected and fixed versions

WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 4.3.0 through 4.9.0, the WeeChat relay module's WebSocket permessage-deflate decompression function relay_websocket_inflate() has no upper bound on output size. An authenticated relay user can send a small compressed WebSocket frame (~100 bytes) that decompresses to gigabytes, exhausting all server memory and crashing the entire WeeChat process. The api protocol enables permessage-deflate and requires authentication before WebSocket upgrade. Version 4.9.1 patches the issue.

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Aug 9, 2026, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.48% · Oct 27, 2026

Projects and upstream resources

[weechat][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "weechat",
      "status": "fixed",
      "release": "sid",
      "version": "4.10.0-1"
    },
    {
      "name": "weechat",
      "status": "fixed",
      "release": "forky",
      "version": "4.10.0-1"
    },
    {
      "name": "weechat",
      "status": "vulnerable",
      "release": "trixie",
      "version": "4.6.3-1"
    },
    {
      "name": "weechat",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "3.8-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "4.9.3-1"
    },
    {
      "bug": null,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "4.9.3-1"
    },
    {
      "bug": null,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "weechat",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.6-2",
        "2.6-2build1",
        "2.6-2build2",
        "2.6-2ubuntu1",
        "2.6-2ubuntu2",
        "2.8-1",
        "2.8-1ubuntu0.1~esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-53524"
    },
    {
      "name": "weechat",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "3.3-1",
        "3.3-1ubuntu1",
        "3.4-2",
        "3.4-2build1",
        "3.4-2build2",
        "3.4.1-1",
        "3.5-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-53524"
    },
    {
      "name": "weechat",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "4.0.5-1",
        "4.1.1-1",
        "4.1.1-1build2",
        "4.1.1-1build3",
        "4.1.1-1build6",
        "4.1.1-1build7"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-53524"
    },
    {
      "name": "weechat",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "4.6.3-1build1",
        "4.7.2-1",
        "4.8.1-1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-53524"
    },
    {
      "name": "weechat",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.10.0-bp160.1.1"
            }
          ]
        }
      ],
      "release": "leap 16.0",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.10.0-bp160.1.1",
      "provider_record_id": "OPENSUSE-SU-2026:21615-1"
    },
    {
      "name": "weechat",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.10.0-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.10.0-1.1",
      "provider_record_id": "OPENSUSE-SU-2026:11481-1"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[weechat]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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]Unknown
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

[openSUSE Tumbleweed]

[weechat]Unknown
Source package: [weechat]
Details (1)
- 4.10.0-1.1 · x86_64 · tumbleweed
  Fixed · Fixed: 4.10.0-1.1
  dsa · weechat · opensuse · tumbleweed
[weechat-devel]Unknown
Source package: [weechat]
Details (1)
- 4.10.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 4.10.0-1.1
  Version impact unknown
  dsa · weechat · opensuse · tumbleweed
[weechat-lang]Unknown
Source package: [weechat]
Details (1)
- 4.10.0-1.1 · noarch · tumbleweed
  Unknown · Fixed: 4.10.0-1.1
  Version impact unknown
  dsa · weechat · opensuse · tumbleweed
[weechat-lua]Unknown
Source package: [weechat]
Details (1)
- 4.10.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 4.10.0-1.1
  Version impact unknown
  dsa · weechat · opensuse · tumbleweed
[weechat-perl]Unknown
Source package: [weechat]
Details (1)
- 4.10.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 4.10.0-1.1
  Version impact unknown
  dsa · weechat · opensuse · tumbleweed
[weechat-python]Unknown
Source package: [weechat]
Details (1)
- 4.10.0-1.1 · x86_64 · tumbleweed
  Unknown · Fixed: 4.10.0-1.1
  Version impact unknown
  dsa · weechat · opensuse · tumbleweed

Next results

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]