A heap buffer over-read vulnerability was discovered in libsoup's (versions: libsoup 3.0 to 3.7.0) HTTP/2 connection tracking framework. When the library processes an HTTP/2 GOAWAY frame, it improperly handles the "Additional Debug Data" payload by assuming the data stream is a safely NUL-terminated C-string. Because the parser lacks strict length-boundary verification before reading this data, a remote, unauthenticated attacker can intentionally send a malformed GOAWAY frame missing the appropriate null delimiter. This causes the library to read past the end of the allocated buffer, triggering an application crash that results in a denial of service (DoS), or potentially exposing fragments of memory contents.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ce24b84bb1 advisory.

    Fixes lots of CVEs: see the fixes section for details

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-fce2f41203 advisory.

    Fixes lots of CVEs: see the fixes section for details

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-2026-3f60ccf61f advisory.

    Fixes lots of CVEs: see the fixes section for details

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

  - A heap buffer over-read vulnerability was discovered in libsoup's (versions: libsoup 3.0 to 3.7.0) HTTP/2     connection tracking framework. When the library processes an HTTP/2 GOAWAY frame, it improperly handles     the Additional Debug Data payload by assuming the data stream is a safely NUL-terminated C-string.
    Because the parser lacks strict length-boundary verification before reading this data, a remote,     unauthenticated attacker can intentionally send a malformed GOAWAY frame missing the appropriate null     delimiter. This causes the library to read past the end of the allocated buffer, triggering an application     crash that results in a denial of service (DoS), or potentially exposing fragments of memory contents.
    (CVE-2026-15712)

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

ID	Name	Product	Family	Type	Severity
344981	Fedora 45 : libsoup3 (2026-ce24b84bb1)	Nessus	Fedora Local Security Checks	Local	medium
344486	Fedora 43 : libsoup3 (2026-fce2f41203)	Nessus	Fedora Local Security Checks	Local	medium
343791	Fedora 44 : libsoup3 (2026-3f60ccf61f)	Nessus	Fedora Local Security Checks	Local	medium
326907	Linux Distros Unpatched Vulnerability : CVE-2026-15712	Nessus	Misc.	Local	medium

Detections

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CVE-2026-15712

medium

Tenable Plugins

medium

medium

medium

medium