ubuntu-cve-2026-15747
Vulnerability from osv_ubuntu
Published
2026-07-14 18:17
Modified
2026-07-14 18:17
Summary
Details

Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle. _csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden csrf_token input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle. An attacker able to query it can recover the token and pass csrf_protect validation.

Severity
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmojolicious-perl",
            "binary_version": "6.15+dfsg-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libmojolicious-perl",
        "purl": "pkg:deb/ubuntu/libmojolicious-perl@6.15+dfsg-1ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.15+dfsg-1",
        "6.15+dfsg-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmojolicious-perl",
            "binary_version": "7.59+dfsg-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libmojolicious-perl",
        "purl": "pkg:deb/ubuntu/libmojolicious-perl@7.59+dfsg-1ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.39+dfsg-1ubuntu1",
        "7.43+dfsg-1ubuntu1",
        "7.57+dfsg-1ubuntu1",
        "7.59+dfsg-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmojolicious-perl",
            "binary_version": "8.33+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libmojolicious-perl",
        "purl": "pkg:deb/ubuntu/libmojolicious-perl@8.33+dfsg-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.22+dfsg-1",
        "8.23+dfsg-1",
        "8.26+dfsg-1",
        "8.27+dfsg-1",
        "8.32+dfsg-1",
        "8.33+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmojolicious-perl",
            "binary_version": "9.22+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libmojolicious-perl",
        "purl": "pkg:deb/ubuntu/libmojolicious-perl@9.22+dfsg-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.71+dfsg-1",
        "9.22+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmojolicious-perl",
            "binary_version": "9.35+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libmojolicious-perl",
        "purl": "pkg:deb/ubuntu/libmojolicious-perl@9.35+dfsg-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.33+dfsg-1",
        "9.35+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmojolicious-perl",
            "binary_version": "9.42+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libmojolicious-perl",
        "purl": "pkg:deb/ubuntu/libmojolicious-perl@9.42+dfsg-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.39+dfsg-1",
        "9.42+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle. _csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden `csrf_token` input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle. An attacker able to query it can recover the token and pass csrf_protect validation.",
  "id": "UBUNTU-CVE-2026-15747",
  "modified": "2026-07-14T18:17:00Z",
  "published": "2026-07-14T18:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15747"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-15747"
    },
    {
      "type": "REPORT",
      "url": "https://lists.security.metacpan.org/cve-announce/msg/41816171/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/mojolicious/mojo/commit/01921fbbbbeca2d1397e082d4a647f9b84c24e27.patch"
    },
    {
      "type": "REPORT",
      "url": "https://metacpan.org/release/SRI/Mojolicious-9.48/changes"
    },
    {
      "type": "REPORT",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/14/16"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-15747"
  ]
}



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