ubuntu-cve-2026-15711
Vulnerability from osv_ubuntu
Published
2026-07-14 20:16
Modified
2026-07-14 20:16
Summary
Details

A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-2.4",
            "binary_version": "2.52.2-1ubuntu0.3+esm6"
          },
          {
            "binary_name": "libsoup-gnome2.4-1",
            "binary_version": "2.52.2-1ubuntu0.3+esm6"
          },
          {
            "binary_name": "libsoup2.4-1",
            "binary_version": "2.52.2-1ubuntu0.3+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.52.2-1ubuntu0.3+esm6?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.50.0-2debian1",
        "2.52.1-1",
        "2.52.2-1",
        "2.52.2-1ubuntu0.1",
        "2.52.2-1ubuntu0.2",
        "2.52.2-1ubuntu0.3",
        "2.52.2-1ubuntu0.3+esm1",
        "2.52.2-1ubuntu0.3+esm2",
        "2.52.2-1ubuntu0.3+esm3",
        "2.52.2-1ubuntu0.3+esm4",
        "2.52.2-1ubuntu0.3+esm5",
        "2.52.2-1ubuntu0.3+esm6"
      ]
    },
    {
      "ecosystem_specific": {
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          {
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            "binary_version": "2.62.1-1ubuntu0.4+esm7"
          },
          {
            "binary_name": "libsoup-gnome2.4-1",
            "binary_version": "2.62.1-1ubuntu0.4+esm7"
          },
          {
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            "binary_version": "2.62.1-1ubuntu0.4+esm7"
          }
        ]
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      "package": {
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        "purl": "pkg:deb/ubuntu/libsoup2.4@2.62.1-1ubuntu0.4+esm7?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
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        "2.60.2-1",
        "2.60.2-2",
        "2.60.3-1",
        "2.61.90-1",
        "2.62.0-1",
        "2.62.1-1",
        "2.62.1-1ubuntu0.1",
        "2.62.1-1ubuntu0.3",
        "2.62.1-1ubuntu0.4",
        "2.62.1-1ubuntu0.4+esm1",
        "2.62.1-1ubuntu0.4+esm2",
        "2.62.1-1ubuntu0.4+esm3",
        "2.62.1-1ubuntu0.4+esm4",
        "2.62.1-1ubuntu0.4+esm5",
        "2.62.1-1ubuntu0.4+esm6",
        "2.62.1-1ubuntu0.4+esm7"
      ]
    },
    {
      "ecosystem_specific": {
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            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          },
          {
            "binary_name": "libsoup-gnome2.4-1",
            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          },
          {
            "binary_name": "libsoup2.4-1",
            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          },
          {
            "binary_name": "libsoup2.4-tests",
            "binary_version": "2.70.0-1ubuntu0.5+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.70.0-1ubuntu0.5+esm2?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
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        "2.68.2-1",
        "2.68.2-2",
        "2.68.2-2build2",
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        "2.70.0-1ubuntu0.1",
        "2.70.0-1ubuntu0.2",
        "2.70.0-1ubuntu0.3",
        "2.70.0-1ubuntu0.4",
        "2.70.0-1ubuntu0.5",
        "2.70.0-1ubuntu0.5+esm1",
        "2.70.0-1ubuntu0.5+esm2"
      ]
    },
    {
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          },
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          }
        ]
      },
      "package": {
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        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.74.2-3ubuntu0.7?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
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        "2.74.1-1",
        "2.74.2-2",
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        "2.74.2-3ubuntu0.1",
        "2.74.2-3ubuntu0.2",
        "2.74.2-3ubuntu0.3",
        "2.74.2-3ubuntu0.4",
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      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
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          },
          {
            "binary_name": "libsoup-3.0-0",
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          },
          {
            "binary_name": "libsoup-3.0-common",
            "binary_version": "3.0.7-0ubuntu1+esm7"
          },
          {
            "binary_name": "libsoup-3.0-tests",
            "binary_version": "3.0.7-0ubuntu1+esm7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "libsoup3",
        "purl": "pkg:deb/ubuntu/libsoup3@3.0.7-0ubuntu1+esm7?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.4-2",
        "3.0.4-3",
        "3.0.5-1",
        "3.0.7-0ubuntu1",
        "3.0.7-0ubuntu1+esm1",
        "3.0.7-0ubuntu1+esm2",
        "3.0.7-0ubuntu1+esm3",
        "3.0.7-0ubuntu1+esm4",
        "3.0.7-0ubuntu1+esm5",
        "3.0.7-0ubuntu1+esm6",
        "3.0.7-0ubuntu1+esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gir1.2-soup-2.4",
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          },
          {
            "binary_name": "libsoup-2.4-1",
            "binary_version": "2.74.3-6ubuntu1.7"
          },
          {
            "binary_name": "libsoup-gnome-2.4-1",
            "binary_version": "2.74.3-6ubuntu1.7"
          },
          {
            "binary_name": "libsoup2.4-common",
            "binary_version": "2.74.3-6ubuntu1.7"
          },
          {
            "binary_name": "libsoup2.4-tests",
            "binary_version": "2.74.3-6ubuntu1.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.74.3-6ubuntu1.7?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
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        "2.74.3-2",
        "2.74.3-3",
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        "2.74.3-6ubuntu1.4",
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      ]
    },
    {
      "ecosystem_specific": {
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            "binary_version": "3.4.4-5ubuntu0.7"
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          {
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            "binary_name": "libsoup-3.0-common",
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          {
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      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libsoup3",
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      },
      "ranges": [
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    },
    {
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        "binaries": [
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      },
      "package": {
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        "name": "libsoup3",
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      },
      "ranges": [
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    },
    {
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          {
            "binary_name": "gir1.2-soup-2.4",
            "binary_version": "2.74.3-10.1ubuntu5+esm1"
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          {
            "binary_name": "libsoup-2.4-1",
            "binary_version": "2.74.3-10.1ubuntu5+esm1"
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          {
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          {
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            "binary_version": "2.74.3-10.1ubuntu5+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "libsoup2.4",
        "purl": "pkg:deb/ubuntu/libsoup2.4@2.74.3-10.1ubuntu5+esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.74.3-10.1ubuntu4",
        "2.74.3-10.1ubuntu5",
        "2.74.3-10.1ubuntu5+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "A vulnerability was found in libsoup\u0027s WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 \u00a75.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.",
  "id": "UBUNTU-CVE-2026-15711",
  "modified": "2026-07-14T20:16:00Z",
  "published": "2026-07-14T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15711"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-15711"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-15711"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2499924"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/515"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-15711"
  ]
}



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Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.