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.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ee50c21f92 advisory.

    33.0.6 Release

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-5afe6630dc advisory.

    33.0.6 Release

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-48998)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-48998)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
325136	Fedora 44 : nextcloud (2026-ee50c21f92)	Nessus	Fedora Local Security Checks	Local	high
325111	Fedora 43 : nextcloud (2026-5afe6630dc)	Nessus	Fedora Local Security Checks	Local	high
443073	SCA: security update for guzzlehttp/psr7 (GHSA-34xg-wgjx-8xph)	Tenable Cloud Security	SCA Checks	Local	medium
443073	SCA: security update for guzzlehttp/psr7 (GHSA-34xg-wgjx-8xph)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
317944	Linux Distros Unpatched Vulnerability : CVE-2026-48998	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-48998

medium

Tenable Plugins

high

high

medium

medium

medium