DEBIAN-CVE-2026-1525
Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted: * Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arrays * Applications that accept user-controlled header names without case-normalization Potential consequences: * Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-Length headers (400 Bad Request) * HTTP Request Smuggling: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking
DEBIAN-CVE-2026-1525
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-2026-1525
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-2026-1525.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-2026-1525.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56139 · Revision 1
- Added to Heist Feed
- Publisher date