ubuntu-cve-2026-53524
Vulnerability from osv_ubuntu
Published
2026-08-21 23:16
Modified
2026-09-02 16:20
Summary
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.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "weechat",
"purl": "pkg:deb/ubuntu/weechat@1.4-2ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "1.9.1-1ubuntu1+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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "weechat",
"purl": "pkg:deb/ubuntu/weechat@1.9.1-1ubuntu1+esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "weechat",
"purl": "pkg:deb/ubuntu/weechat@2.8-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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_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"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "weechat",
"purl": "pkg:deb/ubuntu/weechat@3.5-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "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"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "weechat",
"purl": "pkg:deb/ubuntu/weechat@4.1.1-1build7?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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_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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "weechat",
"purl": "pkg:deb/ubuntu/weechat@4.8.1-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.6.3-1build1",
"4.7.2-1",
"4.8.1-1"
]
}
],
"aliases": [],
"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\u0027s 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.",
"id": "UBUNTU-CVE-2026-53524",
"modified": "2026-09-02T16:20:00Z",
"published": "2026-08-21T23:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-53524"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-53524"
},
{
"type": "REPORT",
"url": "https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3"
},
{
"type": "REPORT",
"url": "https://weechat.org/doc/weechat/security/WSA-2026-1/"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-53524"
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…