fast-uri serializes the port component of a URI without validating it. When recomposing the authority, the userinfo and host components are escaped but the port is concatenated verbatim, so a port value that is not a sequence of digits can inject authority delimiters, demoting the intended host to userinfo and pointing the authority at an attacker-controlled host. Both fast-uri and Node's URL read the result back as the attacker's host with no error, so re-validating the built URI does not catch it. This affects applications that build URIs from parts and assign untrusted data to the port component through the serialize, normalize, or equal functions in their object forms. The issue affects fast-uri versions before 2.4.6, from 3.0.0 before 3.1.7, and from 4.0.0 before 4.1.4. It is fixed in 2.4.6, 3.1.7, and 4.1.4, where recomposeAuthority rejects any port that is not a digit sequence per RFC 3986.

The remote RockyLinux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RLSA-2026:71543 advisory.

    * fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)

    * fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)

    * fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects (CVE-2026-76172)

    * fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization (CVE-2026-84292)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2026-71543 advisory.

    [94.4-1.0.1]
    - Switch to old frotend [Orabug: 38011073] [Orabug: 37856296] [Orabug: 37856375]
    - Replaced additional upstream url [Orabug: 37856187]
    - Replaced upstream urls in documentation with oracle links [Orabug: 37856187]

    [94.4-1]
    - New upstream release

Tenable has extracted the preceding description block directly from the Oracle Linux 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 Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:71543 advisory.

    The image-builder-frontend generates custom images suitable for deploying systems or uploading to the     cloud. It integrates into Cockpit as a frontend for osbuild.

    Security Fix(es):

    * fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)

    * fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)

    * fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects (CVE-2026-76172)

    * fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization (CVE-2026-84292)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - fast-uri serializes the port component of a URI without validating it. When recomposing the authority, the     userinfo and host components are escaped but the port is concatenated verbatim, so a port value that is     not a sequence of digits can inject authority delimiters, demoting the intended host to userinfo and     pointing the authority at an attacker-controlled host. Both fast-uri and Node's URL read the result back     as the attacker's host with no error, so re-validating the built URI does not catch it. This affects     applications that build URIs from parts and assign untrusted data to the port component through the     serialize, normalize, or equal functions in their object forms. The issue affects fast-uri versions before     2.4.6, from 3.0.0 before 3.1.7, and from 4.0.0 before 4.1.4. It is fixed in 2.4.6, 3.1.7, and 4.1.4, where     recomposeAuthority rejects any port that is not a digit sequence per RFC 3986. (CVE-2026-84292)

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

ID	Name	Product	Family	Type	Severity
350313	RockyLinux 10 : cockpit-image-builder (RLSA-2026:71543)	Nessus	Rocky Linux Local Security Checks	Local	high
350189	Oracle Linux 10 : cockpit-image-builder (ELSA-2026-71543)	Nessus	Oracle Linux Local Security Checks	Local	high
349732	RHEL 10 : cockpit-image-builder (RHSA-2026:71543)	Nessus	Red Hat Local Security Checks	Local	high
342555	Linux Distros Unpatched Vulnerability : CVE-2026-84292	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-84292

high

Tenable Plugins

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high

high

high