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DEBIAN-CVE-2026-48998

Type: advisorySource: OSV1 source record

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.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-48998

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-48998

php-guzzlehttp-psr7

Source reference: /affected/0/package/name

Affected versions
2.4.5-1

Source reference: /affected/0/versions

Fixed versions
2.4.5-1+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

php-guzzlehttp-psr7

Source reference: /affected/1/package/name

Affected versions
2.7.1-1

Source reference: /affected/1/versions

Fixed versions
2.7.1-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

php-guzzlehttp-psr7

Source reference: /affected/2/package/name

Affected versions
2.7.1-1

Source reference: /affected/2/versions

2.8.0-1

Source reference: /affected/2/versions

2.8.0-2

Source reference: /affected/2/versions

2.9.0-1

Source reference: /affected/2/versions

2.9.0-2

Source reference: /affected/2/versions

Fixed versions
2.10.3-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57744 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-48998 · Revision 1Source updated