CVE catalog

CVE-2020-8955

weechat affected and fixed versions

irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a malformed IRC message 324 (channel mode).

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Feb 12, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 3.45% · 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.

Distribution / release	Package	Version	Status	Source
Debiantrixie	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debiantrixie	weechat	`4.6.3-1`	Fixed	[CVE-2020-8955]
Debiansid	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debiansid	weechat	`4.10.0-1`	Fixed	[CVE-2020-8955]
Debianforky	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debianforky	weechat	`4.10.0-1`	Fixed	[CVE-2020-8955]
Debianbookworm	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debianbookworm	weechat	`3.8-1`	Fixed	[CVE-2020-8955]

Showing 8 fix observations. All 15 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debianbookworm	weechat	`3.8-1`	Fixed	[CVE-2020-8955]
Debianforky	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debianforky	weechat	`4.10.0-1`	Fixed	[CVE-2020-8955]
Debiansid	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debiansid	weechat	`4.10.0-1`	Fixed	[CVE-2020-8955]
Debiantrixie	weechat	`2.7.1-1`	FixedDistribution-reported fixed boundary	[CVE-2020-8955]
Debiantrixie	weechat	`4.6.3-1`	Fixed	[CVE-2020-8955]
Opensuseleap 15.1	weechat	`2.1-bp151.4.3.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2020:0248-1]Feb 4, 2026, 2:49:50 AM UTC
Susepackage hub 15	weechat	`2.1-bp151.4.3.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2020:0248-1]Feb 4, 2026, 2:49:50 AM UTC
Susepackage hub 15 sp1	weechat	`2.1-bp151.4.3.1`	UnknownSource applicability is not established	[OPENSUSE-SU-2020:0248-1]Feb 4, 2026, 2:49:50 AM UTC
Ubuntupro	weechat	`1.9.1-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-8955]Apr 22, 2026, 12:44:14 PM UTC
Ubuntupro	weechat	`1.9.1-1build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-8955]Apr 22, 2026, 12:44:14 PM UTC
Ubuntupro	weechat	`1.9.1-1ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-8955]Apr 22, 2026, 12:44:14 PM UTC
Ubuntupro	weechat	`1.9.1-1ubuntu1+esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2020-8955]Apr 22, 2026, 12:44:14 PM UTC

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": "fixed",
      "release": "trixie",
      "version": "4.6.3-1"
    },
    {
      "name": "weechat",
      "status": "fixed",
      "release": "bookworm",
      "version": "3.8-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 951289,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.7.1-1"
    },
    {
      "bug": 951289,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.7.1-1"
    },
    {
      "bug": 951289,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "2.7.1-1"
    },
    {
      "bug": 951289,
      "name": "weechat",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "2.7.1-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "weechat",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.1-1ubuntu1+esm1"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1.9.1-1",
        "1.9.1-1build1",
        "1.9.1-1ubuntu1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-8955",
      "fixed_version": "1.9.1-1ubuntu1+esm1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-8955",
      "provider_updated_at": "2026-04-22T12:44:14.436752Z",
      "applicability_unknown": true
    },
    {
      "name": "weechat",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1-bp151.4.3.1"
            }
          ]
        }
      ],
      "release": "package hub 15",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2020:0248-1",
      "fixed_version": "2.1-bp151.4.3.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2020:0248-1",
      "provider_updated_at": "2026-02-04T02:49:50.742212Z",
      "applicability_unknown": true
    },
    {
      "name": "weechat",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1-bp151.4.3.1"
            }
          ]
        }
      ],
      "release": "package hub 15 sp1",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2020:0248-1",
      "fixed_version": "2.1-bp151.4.3.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2020:0248-1",
      "provider_updated_at": "2026-02-04T02:49:50.742212Z",
      "applicability_unknown": true
    },
    {
      "name": "weechat",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1-bp151.4.3.1"
            }
          ]
        }
      ],
      "release": "leap 15.1",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2020:0248-1",
      "fixed_version": "2.1-bp151.4.3.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2020:0248-1",
      "provider_updated_at": "2026-02-04T02:49:50.742212Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #951289]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[weechat]Unknown
Details (4)
- 3.8-1 · all · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · all · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-core]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-curses]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-dev]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-doc]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · all · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · all · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · all · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-guile]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-headless]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-lua]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-perl]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-php]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-plugins]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-python]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-ruby]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
[weechat-tcl]Unknown
Source package: [weechat]
Details (4)
- 3.8-1 · amd64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 3.8-1 · arm64 · bookworm
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · amd64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12
- 4.6.3-1~bpo12+1 · arm64 · bookworm-backports
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · bookworm; dsa · weechat · debian · 12

[Debian 13 (Trixie)]

[weechat]Unknown
Details (2)
- 4.6.3-1 · all · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
- 4.6.3-1 · all · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
[weechat-core]Unknown
Source package: [weechat]
Details (2)
- 4.6.3-1 · amd64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
- 4.6.3-1 · arm64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
[weechat-curses]Unknown
Source package: [weechat]
Details (2)
- 4.6.3-1 · amd64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
- 4.6.3-1 · arm64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
[weechat-dev]Unknown
Source package: [weechat]
Details (2)
- 4.6.3-1 · amd64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
- 4.6.3-1 · arm64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
[weechat-doc]Unknown
Source package: [weechat]
Details (2)
- 4.6.3-1 · all · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
- 4.6.3-1 · all · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
[weechat-guile]Unknown
Source package: [weechat]
Details (2)
- 4.6.3-1 · amd64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13
- 4.6.3-1 · arm64 · trixie
  Fixed · Fixed: 2.7.1-1
  dsa · weechat · debian · 13

Next results

Observed: Oct 23, 2026, 5:53:39 PM UTC

References

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