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DEBIAN-CVE-2026-1525

Type: advisorySource: OSV1 source record

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

Announced Source revision 1
Original source ↗

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/versions

7.15.0+dfsg+~cs3.2.0-3

Source reference: /affected/0/versions

7.16.0+dfsg+~cs3.2.0-1

Source reference: /affected/0/versions

7.16.0+dfsg+~cs3.2.0-2

Source reference: /affected/0/versions

7.18.2+dfsg+~cs3.2.0-1

Source reference: /affected/0/versions

7.24.5+dfsg+~cs3.2.0-1

Source reference: /affected/0/versions

7.24.6+dfsg+~cs3.2.0-1

Source reference: /affected/0/versions

7.24.6+dfsg+~cs3.2.0-2

Source reference: /affected/0/versions

7.24.6+dfsg+~cs3.2.0-3

Source reference: /affected/0/versions

7.3.0+dfsg1+~cs24.12.11-1

Source reference: /affected/0/versions

7.3.0+dfsg1+~cs24.12.11-2

Source reference: /affected/0/versions

8.10.2+dfsg+~cs3.2.2-1

Source reference: /affected/0/versions

8.5.0+dfsg+~cs3.2.0-1

Source reference: /affected/0/versions

8.5.0+dfsg+~cs3.2.0-2

Source reference: /affected/0/versions

8.5.0+dfsg+~cs3.2.0-3

Source reference: /affected/0/versions

8.9.0+dfsg+~cs3.2.0-1

Source 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/versions

7.15.0+dfsg+~cs3.2.0-3

Source reference: /affected/1/versions

7.16.0+dfsg+~cs3.2.0-1

Source reference: /affected/1/versions

7.16.0+dfsg+~cs3.2.0-2

Source reference: /affected/1/versions

7.18.2+dfsg+~cs3.2.0-1

Source reference: /affected/1/versions

7.3.0+dfsg1+~cs24.12.11-1

Source reference: /affected/1/versions

7.3.0+dfsg1+~cs24.12.11-2

Source 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
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