A flaw was found in libsoup, a library used by applications to send network requests. This vulnerability occurs because libsoup does not properly validate hostnames, allowing special characters to be injected into HTTP headers. A remote attacker could exploit this to perform HTTP smuggling, where they can send hidden, malicious requests alongside legitimate ones. In certain situations, this could lead to Server-Side Request Forgery (SSRF), enabling an attacker to force the server to make unauthorized requests to other internal or external systems. The impact is low, as SoupServer is not actually used in internet infrastructure.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-6c3a4775a6 advisory.

    Fixes a few CVEs:

    - CVE-2026-102560
    - CVE-2026-102559
    - CVE-2026-102558
    - CVE-2026-102555
    - CVE-2026-102556
    - CVE-2026-102557
    - CVE-2026-85197
    - CVE-2026-103399
    - CVE-2026-85534
    - CVE-2026-3633
    - CVE-2026-3099

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 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f06a7887af advisory.

    Fixes a few CVEs:

    - CVE-2026-102560
    - CVE-2026-102559
    - CVE-2026-102558
    - CVE-2026-102555
    - CVE-2026-102556
    - CVE-2026-102557
    - CVE-2026-85197
    - CVE-2026-103399
    - CVE-2026-85534
    - CVE-2026-3633
    - CVE-2026-3099

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:

  - A flaw was found in libsoup, a library used by applications to send network requests. This vulnerability
    occurs because libsoup does not properly validate hostnames, allowing special characters to be injected
    into HTTP headers. A remote attacker could exploit this to perform HTTP smuggling, where they can send
    hidden, malicious requests alongside legitimate ones. In certain situations, this could lead to Server-
    Side Request Forgery (SSRF), enabling an attacker to force the server to make unauthorized requests to
    other internal or external systems. The impact is low, as SoupServer is not actually used in internet
    infrastructure. (CVE-2026-3632)

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

  - A flaw was found in libsoup, a library used by applications to send network requests. This vulnerability     occurs because libsoup does not properly validate hostnames, allowing special characters to be injected     into HTTP headers. A remote attacker could exploit this to perform HTTP smuggling, where they can send     hidden, malicious requests alongside legitimate ones. In certain situations, this could lead to Server-     Side Request Forgery (SSRF), enabling an attacker to force the server to make unauthorized requests to     other internal or external systems. The impact is low, as SoupServer is not actually used in internet     infrastructure. (CVE-2026-3632)

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

ID	Name	Product	Family	Type	Severity
379573	Fedora 43 : libsoup3 (2026-6c3a4775a6)	Nessus	Fedora Local Security Checks	Local	critical
375405	Fedora 44 : libsoup3 (2026-f06a7887af)	Nessus	Fedora Local Security Checks	Local	critical
462534	Echo: libsoup3: security update to 3.6.6-1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
462534	Echo: libsoup3: security update to 3.6.6-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
301505	Linux Distros Unpatched Vulnerability : CVE-2026-3632	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-3632

medium

Tenable Plugins

critical

critical

medium

medium

medium