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DEBIAN-CVE-2025-66418

Type: advisorySource: OSV1 source record

urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2025-66418

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-2025-66418

python-urllib3

Source reference: /affected/0/package/name

Affected versions
1.26.12-1

Source reference: /affected/0/versions

1.26.12-1+deb12u1

Source reference: /affected/0/versions

Fixed versions
1.26.12-1+deb12u2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

python-urllib3

Source reference: /affected/1/package/name

Affected versions
2.3.0-3

Source reference: /affected/1/versions

Fixed versions
2.3.0-3+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

python-urllib3

Source reference: /affected/2/package/name

Affected versions
2.3.0-3

Source reference: /affected/2/versions

2.5.0-1

Source reference: /affected/2/versions

Fixed versions
2.5.0-1.1

Source reference: /affected/2/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"
          },
          {
            "fixed": "1.26.12-1+deb12u2"
          }
        ]
      }
    ],
    "package": {
      "name": "python-urllib3",
      "purl": "pkg:deb/debian/python-urllib3?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.26.12-1",
      "1.26.12-1+deb12u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-66418.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.3.0-3+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "python-urllib3",
      "purl": "pkg:deb/debian/python-urllib3?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.3.0-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-66418.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.5.0-1.1"
          }
        ]
      }
    ],
    "package": {
      "name": "python-urllib3",
      "purl": "pkg:deb/debian/python-urllib3?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.3.0-3",
      "2.5.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-66418.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#18740 · Revision 1
Added to Heist Feed
Publisher date
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