DEBIAN-CVE-2026-1526
The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive. The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.
DEBIAN-CVE-2026-1526
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-1526
node-undici
Source reference: /affected/0/package/name
- Affected versions
- 7.15.0+dfsg+~cs3.2.0-1
Source reference:
/affected/0/versions7.15.0+dfsg+~cs3.2.0-3Source reference:
/affected/0/versions7.16.0+dfsg+~cs3.2.0-1Source reference:
/affected/0/versions7.16.0+dfsg+~cs3.2.0-2Source reference:
/affected/0/versions7.18.2+dfsg+~cs3.2.0-1Source reference:
/affected/0/versions7.24.5+dfsg+~cs3.2.0-1Source reference:
/affected/0/versions7.24.6+dfsg+~cs3.2.0-1Source reference:
/affected/0/versions7.24.6+dfsg+~cs3.2.0-2Source reference:
/affected/0/versions7.24.6+dfsg+~cs3.2.0-3Source reference:
/affected/0/versions7.3.0+dfsg1+~cs24.12.11-1Source reference:
/affected/0/versions7.3.0+dfsg1+~cs24.12.11-2Source reference:
/affected/0/versions8.10.2+dfsg+~cs3.2.2-1Source reference:
/affected/0/versions8.5.0+dfsg+~cs3.2.0-1Source reference:
/affected/0/versions8.5.0+dfsg+~cs3.2.0-2Source reference:
/affected/0/versions8.5.0+dfsg+~cs3.2.0-3Source reference:
/affected/0/versions8.9.0+dfsg+~cs3.2.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
node-undici
Source reference: /affected/1/package/name
- Affected versions
- 7.15.0+dfsg+~cs3.2.0-1
Source reference:
/affected/1/versions7.15.0+dfsg+~cs3.2.0-3Source reference:
/affected/1/versions7.16.0+dfsg+~cs3.2.0-1Source reference:
/affected/1/versions7.16.0+dfsg+~cs3.2.0-2Source reference:
/affected/1/versions7.18.2+dfsg+~cs3.2.0-1Source reference:
/affected/1/versions7.3.0+dfsg1+~cs24.12.11-1Source reference:
/affected/1/versions7.3.0+dfsg1+~cs24.12.11-2Source reference:
/affected/1/versions - Fixed versions
- 7.24.5+dfsg+~cs3.2.0-1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-undici",
"purl": "pkg:deb/debian/node-undici?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"7.15.0+dfsg+~cs3.2.0-1",
"7.15.0+dfsg+~cs3.2.0-3",
"7.16.0+dfsg+~cs3.2.0-1",
"7.16.0+dfsg+~cs3.2.0-2",
"7.18.2+dfsg+~cs3.2.0-1",
"7.24.5+dfsg+~cs3.2.0-1",
"7.24.6+dfsg+~cs3.2.0-1",
"7.24.6+dfsg+~cs3.2.0-2",
"7.24.6+dfsg+~cs3.2.0-3",
"7.3.0+dfsg1+~cs24.12.11-1",
"7.3.0+dfsg1+~cs24.12.11-2",
"8.10.2+dfsg+~cs3.2.2-1",
"8.5.0+dfsg+~cs3.2.0-1",
"8.5.0+dfsg+~cs3.2.0-2",
"8.5.0+dfsg+~cs3.2.0-3",
"8.9.0+dfsg+~cs3.2.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1526.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.24.5+dfsg+~cs3.2.0-1"
}
]
}
],
"package": {
"name": "node-undici",
"purl": "pkg:deb/debian/node-undici?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"7.15.0+dfsg+~cs3.2.0-1",
"7.15.0+dfsg+~cs3.2.0-3",
"7.16.0+dfsg+~cs3.2.0-1",
"7.16.0+dfsg+~cs3.2.0-2",
"7.18.2+dfsg+~cs3.2.0-1",
"7.3.0+dfsg1+~cs24.12.11-1",
"7.3.0+dfsg1+~cs24.12.11-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-1526.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56136 · Revision 1
- Added to Heist Feed
- Publisher date