ubuntu-cve-2026-58055
Vulnerability from osv_ubuntu
Published
2026-06-28 02:16
Modified
2026-07-02 16:17
Summary
Details

nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.

Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
6.3 (Medium)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnghttp2-14",
            "binary_version": "1.7.1-1ubuntu0.1~esm3"
          },
          {
            "binary_name": "nghttp2",
            "binary_version": "1.7.1-1ubuntu0.1~esm3"
          },
          {
            "binary_name": "nghttp2-client",
            "binary_version": "1.7.1-1ubuntu0.1~esm3"
          },
          {
            "binary_name": "nghttp2-proxy",
            "binary_version": "1.7.1-1ubuntu0.1~esm3"
          },
          {
            "binary_name": "nghttp2-server",
            "binary_version": "1.7.1-1ubuntu0.1~esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "nghttp2",
        "purl": "pkg:deb/ubuntu/nghttp2@1.7.1-1ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.7-1",
        "1.3.4-2",
        "1.4.0-1",
        "1.4.0-2",
        "1.5.0-2",
        "1.6.0-1",
        "1.7.0-1",
        "1.7.1-1",
        "1.7.1-1ubuntu0.1~esm1",
        "1.7.1-1ubuntu0.1~esm2",
        "1.7.1-1ubuntu0.1~esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnghttp2-14",
            "binary_version": "1.30.0-1ubuntu1+esm3"
          },
          {
            "binary_name": "nghttp2",
            "binary_version": "1.30.0-1ubuntu1+esm3"
          },
          {
            "binary_name": "nghttp2-client",
            "binary_version": "1.30.0-1ubuntu1+esm3"
          },
          {
            "binary_name": "nghttp2-proxy",
            "binary_version": "1.30.0-1ubuntu1+esm3"
          },
          {
            "binary_name": "nghttp2-server",
            "binary_version": "1.30.0-1ubuntu1+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "nghttp2",
        "purl": "pkg:deb/ubuntu/nghttp2@1.30.0-1ubuntu1+esm3?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.25.0-1",
        "1.27.0-1",
        "1.28.0-1",
        "1.29.0-1",
        "1.29.0-1build1",
        "1.30.0-1",
        "1.30.0-1ubuntu1",
        "1.30.0-1ubuntu1+esm1",
        "1.30.0-1ubuntu1+esm2",
        "1.30.0-1ubuntu1+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libnghttp2-14",
            "binary_version": "1.40.0-1ubuntu0.3+esm1"
          },
          {
            "binary_name": "nghttp2",
            "binary_version": "1.40.0-1ubuntu0.3+esm1"
          },
          {
            "binary_name": "nghttp2-client",
            "binary_version": "1.40.0-1ubuntu0.3+esm1"
          },
          {
            "binary_name": "nghttp2-proxy",
            "binary_version": "1.40.0-1ubuntu0.3+esm1"
          },
          {
            "binary_name": "nghttp2-server",
            "binary_version": "1.40.0-1ubuntu0.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "nghttp2",
        "purl": "pkg:deb/ubuntu/nghttp2@1.40.0-1ubuntu0.3+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.39.2-1",
        "1.40.0-1",
        "1.40.0-1build1",
        "1.40.0-1ubuntu0.1",
        "1.40.0-1ubuntu0.2",
        "1.40.0-1ubuntu0.3",
        "1.40.0-1ubuntu0.3+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnghttp2-14",
            "binary_version": "1.43.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2",
            "binary_version": "1.43.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2-client",
            "binary_version": "1.43.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2-proxy",
            "binary_version": "1.43.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2-server",
            "binary_version": "1.43.0-1ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "nghttp2",
        "purl": "pkg:deb/ubuntu/nghttp2@1.43.0-1ubuntu0.4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.43.0-1ubuntu0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.43.0-1",
        "1.43.0-1build1",
        "1.43.0-1build2",
        "1.43.0-1build3",
        "1.43.0-1ubuntu0.1",
        "1.43.0-1ubuntu0.2",
        "1.43.0-1ubuntu0.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnghttp2-14",
            "binary_version": "1.59.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2",
            "binary_version": "1.59.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2-client",
            "binary_version": "1.59.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2-proxy",
            "binary_version": "1.59.0-1ubuntu0.4"
          },
          {
            "binary_name": "nghttp2-server",
            "binary_version": "1.59.0-1ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nghttp2",
        "purl": "pkg:deb/ubuntu/nghttp2@1.59.0-1ubuntu0.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.59.0-1ubuntu0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.55.1-1",
        "1.57.0-1",
        "1.58.0-1",
        "1.59.0-1",
        "1.59.0-1build1",
        "1.59.0-1build2",
        "1.59.0-1build4",
        "1.59.0-1ubuntu0.1",
        "1.59.0-1ubuntu0.2",
        "1.59.0-1ubuntu0.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnghttp2-14",
            "binary_version": "1.64.0-1.1ubuntu1.2"
          },
          {
            "binary_name": "nghttp2",
            "binary_version": "1.64.0-1.1ubuntu1.2"
          },
          {
            "binary_name": "nghttp2-client",
            "binary_version": "1.64.0-1.1ubuntu1.2"
          },
          {
            "binary_name": "nghttp2-proxy",
            "binary_version": "1.64.0-1.1ubuntu1.2"
          },
          {
            "binary_name": "nghttp2-server",
            "binary_version": "1.64.0-1.1ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "nghttp2",
        "purl": "pkg:deb/ubuntu/nghttp2@1.64.0-1.1ubuntu1.2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.64.0-1.1ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.64.0-1ubuntu1",
        "1.64.0-1.1",
        "1.64.0-1.1build1",
        "1.64.0-1.1ubuntu1",
        "1.64.0-1.1ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnghttp2-14",
            "binary_version": "1.68.0-2ubuntu0.2"
          },
          {
            "binary_name": "nghttp2",
            "binary_version": "1.68.0-2ubuntu0.2"
          },
          {
            "binary_name": "nghttp2-client",
            "binary_version": "1.68.0-2ubuntu0.2"
          },
          {
            "binary_name": "nghttp2-proxy",
            "binary_version": "1.68.0-2ubuntu0.2"
          },
          {
            "binary_name": "nghttp2-server",
            "binary_version": "1.68.0-2ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nghttp2",
        "purl": "pkg:deb/ubuntu/nghttp2@1.68.0-2ubuntu0.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.68.0-2ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.64.0-1.1ubuntu1",
        "1.64.0-1.1ubuntu2",
        "1.68.0-1",
        "1.68.0-2",
        "1.68.0-2ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "nghttp2\u0027s nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker\u0027s favor enables HTTP request/response smuggling and cross-client response-queue poisoning.",
  "id": "UBUNTU-CVE-2026-58055",
  "modified": "2026-07-02T16:17:06Z",
  "published": "2026-06-28T02:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58055"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-58055"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bikini/exploitarium/tree/main/nghttp2-nghttpx-upgrade-queue-poison-poc"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-request-with-content-length"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8495-1"
    }
  ],
  "related": [
    "USN-8495-1"
  ],
  "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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-58055"
  ]
}



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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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.