ubuntu-cve-2026-13601
Vulnerability from osv_ubuntu
Published
2026-06-29 10:16
Modified
2026-07-09 15:15
Summary
Details

A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests. This may result in the unauthorized disclosure of sensitive information.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
6.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyelp0",
            "binary_version": "3.18.1-1ubuntu4"
          },
          {
            "binary_name": "yelp",
            "binary_version": "3.18.1-1ubuntu4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "yelp",
        "purl": "pkg:deb/ubuntu/yelp@3.18.1-1ubuntu4?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.16.1-1ubuntu1",
        "3.16.1-1ubuntu2",
        "3.18.1-1ubuntu2",
        "3.18.1-1ubuntu3",
        "3.18.1-1ubuntu4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyelp0",
            "binary_version": "3.26.0-1ubuntu2"
          },
          {
            "binary_name": "yelp",
            "binary_version": "3.26.0-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "yelp",
        "purl": "pkg:deb/ubuntu/yelp@3.26.0-1ubuntu2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.26.0-1ubuntu1",
        "3.26.0-1ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyelp0",
            "binary_version": "3.36.2-0ubuntu1.1"
          },
          {
            "binary_name": "yelp",
            "binary_version": "3.36.2-0ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "yelp",
        "purl": "pkg:deb/ubuntu/yelp@3.36.2-0ubuntu1.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.34.0-1",
        "3.36.0-1",
        "3.36.2-0ubuntu1",
        "3.36.2-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyelp0",
            "binary_version": "42.1-1ubuntu0.1"
          },
          {
            "binary_name": "yelp",
            "binary_version": "42.1-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "yelp",
        "purl": "pkg:deb/ubuntu/yelp@42.1-1ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "40.stable-1build1",
        "41.1-1",
        "41.2-1",
        "42~beta-2",
        "42.0-1",
        "42.1-1",
        "42.1-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyelp0",
            "binary_version": "42.2-1ubuntu0.24.04.1"
          },
          {
            "binary_name": "yelp",
            "binary_version": "42.2-1ubuntu0.24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "yelp",
        "purl": "pkg:deb/ubuntu/yelp@42.2-1ubuntu0.24.04.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "42.2-1",
        "42.2-1build1",
        "42.2-1build2",
        "42.2-1ubuntu0.24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyelp0",
            "binary_version": "42.3-3ubuntu1"
          },
          {
            "binary_name": "yelp",
            "binary_version": "42.3-3ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "yelp",
        "purl": "pkg:deb/ubuntu/yelp@42.3-3ubuntu1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "42.2-2",
        "42.2-4",
        "42.2-4build1",
        "42.3-1",
        "42.3-3ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyelp-1-0",
            "binary_version": "49.0-5"
          },
          {
            "binary_name": "yelp",
            "binary_version": "49.0-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "yelp",
        "purl": "pkg:deb/ubuntu/yelp@49.0-5?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "42.3-3ubuntu1",
        "49.0-4",
        "49.0-5"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can bypass Flatpak\u0027s intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests. This may result in the unauthorized disclosure of sensitive information.",
  "id": "UBUNTU-CVE-2026-13601",
  "modified": "2026-07-09T15:15:45Z",
  "published": "2026-06-29T10:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-13601"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-13601"
    },
    {
      "type": "REPORT",
      "url": "https://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/yelp/-/work_items/238"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-13601"
    },
    {
      "type": "REPORT",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13601.json"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-13601"
  ]
}



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