A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to exhaust memory on the host and cause a denial of service.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:96250 advisory.

    Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network     configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line     sessions, and more.

    Security Fix(es):

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)

    * cockpit: Cockpit: Denial of Service via unbounded connection thread spawning (CVE-2026-91149)

    * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

    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 AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1793953225 advisory.

  - A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every     unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to     exhaust memory on the host and cause a denial of service. (CVE-2026-76235)

  - A flaw was found in Cockpit. An unauthenticated remote attacker can exploit this vulnerability by     initiating and sustaining numerous simultaneous connections to the `cockpit-tls` service. This forces the     service to create an unbounded number of detached threads, consuming system resources such as memory and     file descriptors. The primary consequence is a denial of service (DoS), leading to degradation or complete     unavailability of the Cockpit service for legitimate users. (CVE-2026-91149)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-2273:17 advisory.

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)
      * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-2267:16 advisory.

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)
      * cockpit: Cockpit: Denial of Service via unbounded connection thread spawning (CVE-2026-91149)
      * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_94485 advisory.

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)

    * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

    Bug Fix(es) and Enhancement(s):

    * [cockpit] Overview page should not try to read insights-client.json anymore (JIRA:Rocky Linux-246964)

Tenable has extracted the preceding description block directly from the CIQ 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 Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_94533 advisory.

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)

    * cockpit: Cockpit: Denial of Service via unbounded connection thread spawning (CVE-2026-91149)

    * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

Tenable has extracted the preceding description block directly from the CIQ 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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-150344 advisory.

    A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every     unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to     exhaust memory on the host and cause a denial of service.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:94485 advisory.

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)
      * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)


    Bug Fix(es) and Enhancement(s):

      * [cockpit] Overview page should not try to read insights-client.json anymore (JIRA:RHEL-246964)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:94533 advisory.

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)

    * cockpit: Cockpit: Denial of Service via unbounded connection thread spawning (CVE-2026-91149)

    * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

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 RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:94485 advisory.

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)

    * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

    Bug Fix(es) and Enhancement(s):

    * [cockpit] Overview page should not try to read insights-client.json anymore (JIRA:Rocky Linux-246964)

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 Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:94533 advisory.

    Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network     configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line     sessions, and more.

    Security Fix(es):

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)

    * cockpit: Cockpit: Denial of Service via unbounded connection thread spawning (CVE-2026-91149)

    * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

    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 remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-94533 advisory.

    - ws: Free language string also when it comes from the cookie (RHEL-244637) [CVE-2026-76235]
    - ws: don't crash when urlroot has no trailing slash (RHEL-262905) [CVE-2026-91147]

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 Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-94485 advisory.

    - ws: don't crash when urlroot has no trailing slash (RHEL-262904) [CVE-2026-91147]
    - ws: Free language string also when it comes from the cookie (RHEL-244631) [CVE-2026-76235]

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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:94485 advisory.

    Cockpit enables users to administer GNU/Linux servers using a web browser. It offers network     configuration, log inspection, diagnostic reports, SELinux troubleshooting, interactive command-line     sessions, and more.

    Security Fix(es):

    * cockpit: Cockpit: Denial of Service in `cockpit-ws` due to URL-root handling without a trailing slash     (CVE-2026-91147)

    * cockpit-ws: cockpit: cockpit-ws: unauthenticated remote memory leak via CockpitLang cookie in     send_login_html (CVE-2026-76235)

    Bug Fix(es) and Enhancement(s):

    * [cockpit] Overview page should not try to read insights-client.json anymore (JIRA:RHEL-246964)

    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 Rocky Linux 9.2 host has packages installed that are affected by a vulnerability as referenced in the CIQ ciqsa-2026_1502 advisory.

    This advisory aggregates security fixes for the cockpit SRPM in CIQ LTS 9.2. It addresses 1 CVE:
    CVE-2026-76235.

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-a002299f28 advisory.

    Automatic update for cockpit-367-1.fc45.

    ##### **Changelog for cockpit**

    ```
    * Thu Aug 27 2026 Packit <hello@packit.dev> - 367-1
    - Translation updates

    ```


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-106156 advisory.

    A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every     unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to     exhaust memory on the host and cause a denial of service.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue 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 a vulnerability as referenced in the FEDORA-2026-edff423bf7 advisory.

    Automatic update for cockpit-367-1.fc43.

    ##### **Changelog for cockpit**

    ```
    * Thu Aug 27 2026 Packit <hello@packit.dev> - 367-1
    - Translation updates

    ```


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue 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 a vulnerability as referenced in the FEDORA-2026-4ca90cfeb9 advisory.

    Automatic update for cockpit-367-1.fc44.

    ##### **Changelog for cockpit**

    ```
    * Thu Aug 27 2026 Packit <hello@packit.dev> - 367-1
    - Translation updates

    ```


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6474 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6474-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     August 27, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : cockpit     CVE ID         : CVE-2026-4802 CVE-2026-76235

    Two security vulnerabilities were discovered in Cockpit, a web console     for Linux servers, which could result in the execution of arbitrary code     or denial of service.

    For the stable distribution (trixie), these problems have been fixed in     version 337-1+deb13u2.

    We recommend that you upgrade your cockpit packages.

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

    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.

  - A memory leak flaw was found in cockpit-ws. The login page handler leaks a heap allocation on every     unauthenticated request that carries a CockpitLang cookie, allowing a remote unauthenticated attacker to     exhaust memory on the host and cause a denial of service. (CVE-2026-76235)

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

ID	Name	Product	Family	Type	Severity
377742	RHEL 10 : cockpit (RHSA-2026:96250)	Nessus	Red Hat Local Security Checks	Local	high
376999	AlmaLinux 9.2 [TuxCare] Security Update: cockpit / cockpit-bridge / cockpit-doc / cockpit-packagekit / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1793953225)	Nessus	Alma Linux Local Security Checks	Local	high
376989	MiracleLinux 8 : cockpit-310.10-1.el8_10.ML.1 (AXSA:2026-2273:17)	Nessus	Miracle Linux Local Security Checks	Local	high
376804	MiracleLinux 9 : cockpit-356.4-1.el9_8.ML.1 (AXSA:2026-2267:16)	Nessus	Miracle Linux Local Security Checks	Local	high
376422	Rocky Linux 8 [CIQ] Security Update: cockpit / cockpit-bridge / cockpit-debuginfo / cockpit-debugsource / etc Multiple Vulnerabilities (crlsa-2026_94485)	Nessus	Rocky Linux Local Security Checks	Local	high
376420	Rocky Linux 9 [CIQ] Security Update: cockpit / cockpit-bridge / cockpit-debuginfo / cockpit-debugsource / etc Multiple Vulnerabilities (crlsa-2026_94533)	Nessus	Rocky Linux Local Security Checks	Local	high
376206	Unity Linux 20.1070a Security Update: cockpit (UTSA-2026-150344)	Nessus	Unity Linux Local Security Checks	Local	high
375859	AlmaLinux 8 : cockpit (ALSA-2026:94485)	Nessus	Alma Linux Local Security Checks	Local	high
375853	RockyLinux 9 : cockpit (RLSA-2026:94533)	Nessus	Rocky Linux Local Security Checks	Local	high
375851	RockyLinux 8 : cockpit (RLSA-2026:94485)	Nessus	Rocky Linux Local Security Checks	Local	high
375678	RHEL 9 : cockpit (RHSA-2026:94533)	Nessus	Red Hat Local Security Checks	Local	high
375664	Oracle Linux 9 : cockpit (ELSA-2026-94533)	Nessus	Oracle Linux Local Security Checks	Local	high
375659	Oracle Linux 8 : cockpit (ELSA-2026-94485)	Nessus	Oracle Linux Local Security Checks	Local	high
375546	RHEL 8 : cockpit (RHSA-2026:94485)	Nessus	Red Hat Local Security Checks	Local	high
354172	Rocky Linux 9.2 [CIQ] Security Update: cockpit / cockpit-bridge / cockpit-debuginfo / cockpit-debugsource / etc (ciqsa-2026_1502)	Nessus	Rocky Linux Local Security Checks	Local	high
344890	Fedora 45 : cockpit (2026-a002299f28)	Nessus	Fedora Local Security Checks	Local	high
342913	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: cockpit (UTSA-2026-106156)	Nessus	Unity Linux Local Security Checks	Local	high
342774	Fedora 43 : cockpit (2026-edff423bf7)	Nessus	Fedora Local Security Checks	Local	high
342274	Fedora 44 : cockpit (2026-4ca90cfeb9)	Nessus	Fedora Local Security Checks	Local	high
341053	Debian dsa-6474 : cockpit - security update	Nessus	Debian Local Security Checks	Local	high
338140	Linux Distros Unpatched Vulnerability : CVE-2026-76235	Nessus	Misc.	Local	high

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CVE-2026-76235

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