ubuntu-cve-2026-34475
Vulnerability from osv_ubuntu
Published
2026-03-27 20:16
Modified
2026-05-20 15:27
Summary
Details

Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi1",
            "binary_version": "3.0.5-2ubuntu0.1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "3.0.5-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@3.0.5-2ubuntu0.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.4-1ubuntu1",
        "3.0.4-1ubuntu2",
        "3.0.5-1ubuntu2",
        "3.0.5-2",
        "3.0.5-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi1",
            "binary_version": "4.1.1-1ubuntu0.2+esm1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "4.1.1-1ubuntu0.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@4.1.1-1ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.3-1",
        "4.1.0-1",
        "4.1.0-2",
        "4.1.1-1",
        "4.1.1-1ubuntu0.2",
        "4.1.1-1ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi1",
            "binary_version": "5.2.1-1ubuntu0.1+esm1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "5.2.1-1ubuntu0.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@5.2.1-1ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.0.0-7.1",
        "5.2.1-1",
        "5.2.1-1ubuntu0.1",
        "5.2.1-1ubuntu0.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi2",
            "binary_version": "6.2.1-2ubuntu0.2+esm1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "6.2.1-2ubuntu0.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@6.2.1-2ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.1.1-1",
        "6.2.1-2",
        "6.2.1-2ubuntu0.1~esm1",
        "6.2.1-2ubuntu0.1~esm2",
        "6.2.1-2ubuntu0.1",
        "6.2.1-2ubuntu0.2",
        "6.2.1-2ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi2",
            "binary_version": "6.6.1-1ubuntu0.2+esm1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "6.6.1-1ubuntu0.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@6.6.1-1ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.5.2-1",
        "6.6.1-1",
        "6.6.1-1ubuntu0.2",
        "6.6.1-1ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi3",
            "binary_version": "7.1.1-1.1ubuntu1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "7.1.1-1.1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@7.1.1-1.1ubuntu1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.1.1-1.1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi3",
            "binary_version": "7.7.3-1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "7.7.3-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@7.7.3-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.7.0-1",
        "7.7.0-2",
        "7.7.0-3",
        "7.7.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libvarnishapi3",
            "binary_version": "7.7.3-1build1"
          },
          {
            "binary_name": "varnish",
            "binary_version": "7.7.3-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "varnish",
        "purl": "pkg:deb/ubuntu/varnish@7.7.3-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.7.3-1",
        "7.7.3-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.",
  "id": "UBUNTU-CVE-2026-34475",
  "modified": "2026-05-20T15:27:23Z",
  "published": "2026-03-27T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34475"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34475"
    },
    {
      "type": "REPORT",
      "url": "https://vinyl-cache.org/security/VSV00018.html"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-34475"
  ]
}



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