php-guzzlehttp-psr7 — security advisory

{
  "id": "ff3dfd7fae6a58366942937191286a0f5f6795cf179a640d43920a180693951b",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-48998",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-48998",
    "summary": "guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Versions prior to 2.10.2 contain improper Host header validation when parsing raw HTTP request messages and when deriving a server request URI from server variables. An attacker can provide a malformed Host header containing URI authority delimiters, such as `trusted.example@evil.example`. When the Host value is used to construct a URI, the malformed value can be reinterpreted as URI userinfo and host. This can cause the PSR-7 request URI host to differ from the original Host header value. Applications are affected if they parse attacker-controlled raw HTTP requests with `GuzzleHttp\\Psr7\\Message::parseRequest()` or the legacy 1.x `GuzzleHttp\\Psr7\\parse_request()` function, or if they build server requests from attacker-controlled server variables, then rely on the resulting URI host for routing, allow-list checks, or forwarding decisions. In affected forwarding or gateway scenarios, this may cause requests or credentials to be sent to an unintended host. The issue is patched in `2.10.2`. `1.x` is end-of-life and will not receive a patch. Some workarounds are available. Validate the `Host` header as `uri-host [ \":\" port ]` before calling `Message::parseRequest()` or legacy `parse_request()` on untrusted HTTP request data, or before deriving routing and forwarding decisions from a parsed request URI. Reject Host values containing userinfo, path, query, or fragment delimiters.",
    "evidence": "osv:DEBIAN-CVE-2026-48998",
    "products": [
      {
        "name": {
          "value": "php-guzzlehttp-psr7",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.4.5-1+deb12u1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.4.5-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "php-guzzlehttp-psr7",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.7.1-1+deb13u1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.7.1-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "php-guzzlehttp-psr7",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.10.3-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.7.1-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.8.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.8.0-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.9.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.9.0-2",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-48998",
      "aliases": [
        "DEBIAN-CVE-2026-48998"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.4.5-1+deb12u1"
                }
              ]
            }
          ],
          "package": {
            "name": "php-guzzlehttp-psr7",
            "purl": "pkg:deb/debian/php-guzzlehttp-psr7?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "2.4.5-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48998.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.7.1-1+deb13u1"
                }
              ]
            }
          ],
          "package": {
            "name": "php-guzzlehttp-psr7",
            "purl": "pkg:deb/debian/php-guzzlehttp-psr7?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "2.7.1-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48998.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.10.3-1"
                }
              ]
            }
          ],
          "package": {
            "name": "php-guzzlehttp-psr7",
            "purl": "pkg:deb/debian/php-guzzlehttp-psr7?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "2.7.1-1",
            "2.8.0-1",
            "2.8.0-2",
            "2.9.0-1",
            "2.9.0-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48998.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-27T09:47:31.997433989Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-48998"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-48998"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-48998",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460950,
  "published_at": "2026-06-11T13:16:33.133+00:00"
}