Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-0c38968a1b advisory.

    Update to latest upstream release https://forum.torproject.org/t/security-     release-0-4-8-25-and-0-4-9-8/21559

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-2026-5ce7cc46bb advisory.

    Update to latest upstream release https://forum.torproject.org/t/security-     release-0-4-8-25-and-0-4-9-8/21559

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 openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20709-1 advisory.

    Changes in tor:

    - Update to 0.4.9.8
      * Fix out-of-bounds read (boo#1264341, CVE-2026-44597, TROVE-2026-011)
      * Do not attempt or accept BEGIN_DIR via conflux legs         (boo#1264342, CVE-2026-44599,TROVE-2026-008)
      * Adjust conflux out-of-order queue accounting when clearing a queue         (boo#1264343, CVE-2026-44600, TROVE-2026-010)
      * Fix a client-side crash caused by double-close of a circuit while         under circuit queue memory pressure         (boo#1264344, CVE-2026-44601, TROVE-2026-009)
      * Fix null pointer dereference when receiving a CERT cell out of         order (boo#1264345, CVE-2026-44602, TROVE-2026-006)
      * Fix off-by-one out-of-bounds read if a malformed BEGIN cell is         received (boo#1264346, CVE-2026-44603, TROVE-2026-007)

    - upate to 0.4.9.5:
      * first stable release in the 0.4.9 series
      * introduces a new circuit-level encryption design for better         client security
      * introduce a more scalable way for large relay operators to         annotate which relays they run so clients can avoid using too         many of them in a single circuit

Tenable has extracted the preceding description block directly from the SUSE 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 Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6260 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6260-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 10, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : tor     CVE ID         : CVE-2026-44597 CVE-2026-44599 CVE-2026-44600                      CVE-2026-44601 CVE-2026-44602 CVE-2026-44603

    Multiple security vulnerabilities were discovered in Tor, a connection-     based low-latency anonymous communication system, which could result in     denial of service.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 0.4.9.8-0+deb12u1.

    For the stable distribution (trixie), these problems have been fixed in     version 0.4.9.8-0+deb13u1.

    We recommend that you upgrade your tor packages.

    For the detailed security status of tor please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/tor

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian 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.

  - Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.
    (CVE-2026-44603)

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

ID	Name	Product	Family	Severity
316893	Fedora 43 : tor (2026-0c38968a1b)	Nessus	Fedora Local Security Checks	critical
316729	Fedora 44 : tor (2026-5ce7cc46bb)	Nessus	Fedora Local Security Checks	critical
313749	openSUSE 16 Security Update : tor (openSUSE-SU-2026:20709-1)	Nessus	SuSE Local Security Checks	critical
313711	Debian dsa-6260 : tor - security update	Nessus	Debian Local Security Checks	critical
313064	Linux Distros Unpatched Vulnerability : CVE-2026-44603	Nessus	Misc.	critical

Detections

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CVE-2026-44603

critical

Tenable Plugins

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