guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Versions prior to 2.10.2 did not reject ASCII control characters, whitespace, or DEL in first-party URI host components. A vulnerable flow is: First, an application accepts a user-controlled URL. Second, the URL is used to construct a PSR-7 `Uri` or `Request`. Third, the host component contains CRLF or another header-unsafe character. Fourth, the host is copied into the PSR-7 `Host` header when no explicit `Host` header is provided. Finally, the request is serialized or sent by an HTTP client that does not independently reject the malformed host. In that flow, an attacker can cause the serialized request to contain additional attacker-controlled header lines. For example, a host containing `"\r\nX-Injected: yes"` can cause the generated `Host` header to span multiple HTTP header lines. Applications are affected when they use user-controlled URLs for outbound HTTP requests, URL forwarding, proxying, crawling, webhook delivery, or similar request-dispatch flows. In deployments involving HTTP/1.1 connection reuse, proxies, gateways, or load balancers, this malformed request may also contribute to request smuggling or cache poisoning, depending on how downstream components parse the request. The issue is patched in `2.10.2` and later. `1.x` is end-of-life and will not receive a patch. As a workaround, validate and reject all untrusted URI strings before constructing PSR-7 `Uri` or `Request` instances. Reject input containing ASCII control characters, whitespace, or DEL, including CRLF, tab, space, NUL, or DEL characters. Applications that forward requests should also ensure the final HTTP client or serializer rejects invalid URI and header data before writing requests to the network.

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 did not
    reject ASCII control characters, whitespace, or DEL in first-party URI host components. A vulnerable flow
    is: First, an application accepts a user-controlled URL. Second, the URL is used to construct a PSR-7
    `Uri` or `Request`. Third, the host component contains CRLF or another header-unsafe character. Fourth,
    the host is copied into the PSR-7 `Host` header when no explicit `Host` header is provided. Finally, the
    request is serialized or sent by an HTTP client that does not independently reject the malformed host. In
    that flow, an attacker can cause the serialized request to contain additional attacker-controlled header
    lines. For example, a host containing `"\r\nX-Injected: yes"` can cause the generated `Host` header to
    span multiple HTTP header lines. Applications are affected when they use user-controlled URLs for outbound
    HTTP requests, URL forwarding, proxying, crawling, webhook delivery, or similar request-dispatch flows. In
    deployments involving HTTP/1.1 connection reuse, proxies, gateways, or load balancers, this malformed
    request may also contribute to request smuggling or cache poisoning, depending on how downstream
    components parse the request. The issue is patched in `2.10.2` and later. `1.x` is end-of-life and will
    not receive a patch. As a workaround, validate and reject all untrusted URI strings before constructing
    PSR-7 `Uri` or `Request` instances. Reject input containing ASCII control characters, whitespace, or DEL,
    including CRLF, tab, space, NUL, or DEL characters. Applications that forward requests should also ensure
    the final HTTP client or serializer rejects invalid URI and header data before writing requests to the
    network. (CVE-2026-49214)

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 did not     reject ASCII control characters, whitespace, or DEL in first-party URI host components. A vulnerable flow     is: First, an application accepts a user-controlled URL. Second, the URL is used to construct a PSR-7     `Uri` or `Request`. Third, the host component contains CRLF or another header-unsafe character. Fourth,     the host is copied into the PSR-7 `Host` header when no explicit `Host` header is provided. Finally, the     request is serialized or sent by an HTTP client that does not independently reject the malformed host. In     that flow, an attacker can cause the serialized request to contain additional attacker-controlled header     lines. For example, a host containing `\r\nX-Injected: yes` can cause the generated `Host` header to     span multiple HTTP header lines. Applications are affected when they use user-controlled URLs for outbound     HTTP requests, URL forwarding, proxying, crawling, webhook delivery, or similar request-dispatch flows. In     deployments involving HTTP/1.1 connection reuse, proxies, gateways, or load balancers, this malformed     request may also contribute to request smuggling or cache poisoning, depending on how downstream     components parse the request. The issue is patched in `2.10.2` and later. `1.x` is end-of-life and will     not receive a patch. As a workaround, validate and reject all untrusted URI strings before constructing     PSR-7 `Uri` or `Request` instances. Reject input containing ASCII control characters, whitespace, or DEL,     including CRLF, tab, space, NUL, or DEL characters. Applications that forward requests should also ensure     the final HTTP client or serializer rejects invalid URI and header data before writing requests to the     network. (CVE-2026-49214)

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

ID	Name	Product	Family	Severity
325136	Fedora 44 : nextcloud (2026-ee50c21f92)	Nessus	Fedora Local Security Checks	high
325111	Fedora 43 : nextcloud (2026-5afe6630dc)	Nessus	Fedora Local Security Checks	high
443078	SCA: security update for guzzlehttp/psr7 (GHSA-hq7v-mx3g-29hw)	Tenable Cloud Security	SCA Checks	medium
443078	SCA: security update for guzzlehttp/psr7 (GHSA-hq7v-mx3g-29hw)	Tenable Self-Hosted Container Security	SCA Checks	medium
317996	Linux Distros Unpatched Vulnerability : CVE-2026-49214	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-49214

medium

Tenable Plugins

high

high

medium

medium

medium