A flaw was found in Libsoup. The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user.

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. The server-side digest authentication implementation in the
    SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing
    nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid
    authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and
    gain unauthorized access to protected resources, impersonating the legitimate user. (CVE-2026-3099)

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. The server-side digest authentication implementation in the     SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing     nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid     authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and     gain unauthorized access to protected resources, impersonating the legitimate user. (CVE-2026-3099)

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
457302	Echo: libsoup3: security update to 3.6.6-1+e3	Tenable Cloud Security	Echo Local Security Checks	Local	high
457302	Echo: libsoup3: security update to 3.6.6-1+e3	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
299871	Linux Distros Unpatched Vulnerability : CVE-2026-3099	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-3099

high

Tenable Plugins

critical

critical

high

high

high