UBUNTU-CVE-2026-53524

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Source
https://ubuntu.com/security/CVE-2026-53524
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53524.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-53524
Upstream
Published
2026-08-21T23:16:00Z
Modified
2026-09-02T19:35:54Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:22.04:LTS
weechat

Package

Name
weechat
Purl
pkg:deb/ubuntu/weechat?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.3-1
3.3-1ubuntu1
3.4-2
3.4-2build1
3.4-2build2
3.4.1-1
3.5-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "weechat",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-core",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-curses",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-guile",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-headless",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-lua",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-perl",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-php",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-plugins",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-python",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-ruby",
            "binary_version": "3.5-1"
        },
        {
            "binary_name": "weechat-tcl",
            "binary_version": "3.5-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53524.json"
Ubuntu:24.04:LTS
weechat

Package

Name
weechat
Purl
pkg:deb/ubuntu/weechat?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
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 specific 

{
    "binaries": [
        {
            "binary_name": "weechat",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-core",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-curses",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-guile",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-headless",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-lua",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-perl",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-php",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-plugins",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-python",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-ruby",
            "binary_version": "4.1.1-1build7"
        },
        {
            "binary_name": "weechat-tcl",
            "binary_version": "4.1.1-1build7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53524.json"
Ubuntu:26.04:LTS
weechat

Package

Name
weechat
Purl
pkg:deb/ubuntu/weechat?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.6.3-1build1
4.7.2-1
4.8.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "weechat",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-core",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-curses",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-guile",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-headless",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-lua",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-perl",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-php",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-plugins",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-python",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-ruby",
            "binary_version": "4.8.1-1"
        },
        {
            "binary_name": "weechat-tcl",
            "binary_version": "4.8.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53524.json"
Ubuntu:Pro:16.04:LTS
weechat

Package

Name
weechat
Purl
pkg:deb/ubuntu/weechat?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.3-1
1.3-1build1
1.4-1
1.4-1build1
1.4-1build2
1.4-2
1.4-2ubuntu0.1
1.4-2ubuntu0.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "weechat",
            "binary_version": "1.4-2ubuntu0.1+esm1"
        },
        {
            "binary_name": "weechat-core",
            "binary_version": "1.4-2ubuntu0.1+esm1"
        },
        {
            "binary_name": "weechat-curses",
            "binary_version": "1.4-2ubuntu0.1+esm1"
        },
        {
            "binary_name": "weechat-plugins",
            "binary_version": "1.4-2ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53524.json"
Ubuntu:Pro:18.04:LTS
weechat

Package

Name
weechat
Purl
pkg:deb/ubuntu/weechat?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.9.1-1
1.9.1-1build1
1.9.1-1ubuntu1
1.9.1-1ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "weechat",
            "binary_version": "1.9.1-1ubuntu1+esm1"
        },
        {
            "binary_name": "weechat-core",
            "binary_version": "1.9.1-1ubuntu1+esm1"
        },
        {
            "binary_name": "weechat-curses",
            "binary_version": "1.9.1-1ubuntu1+esm1"
        },
        {
            "binary_name": "weechat-plugins",
            "binary_version": "1.9.1-1ubuntu1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53524.json"
Ubuntu:Pro:20.04:LTS
weechat

Package

Name
weechat
Purl
pkg:deb/ubuntu/weechat?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6-2
2.6-2build1
2.6-2build2
2.6-2ubuntu1
2.6-2ubuntu2
2.8-1
2.8-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "weechat",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-core",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-curses",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-guile",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-headless",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-lua",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-perl",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-php",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-plugins",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-python",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-ruby",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "weechat-tcl",
            "binary_version": "2.8-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53524.json"