Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

The version of mozilla-firefox installed on the remote host is prior to 140.13.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-202-02 advisory.

    New mozilla-firefox packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-firefox 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 version of Firefox installed on the remote macOS or Mac OS X host is prior to 153.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-68 advisory.

  - Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-16412)

  - Denial-of-service in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153.
    (CVE-2026-16376)

  - Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16359)

  - Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153.
    (CVE-2026-16398)

  - Memory safety bugs present in Firefox 152. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2026-16411)

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

The version of Firefox installed on the remote Windows host is prior to 153.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-68 advisory.

  - Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-16412)

  - Denial-of-service in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153.
    (CVE-2026-16376)

  - Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16359)

  - Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153.
    (CVE-2026-16398)

  - Memory safety bugs present in Firefox 152. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2026-16411)

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

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 140.13. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-70 advisory.

  - We are aware that exploit code for this is public however we are not aware of any attacks in the wild     abusing this flaw. (CVE-2026-15718, CVE-2026-15719)

  - Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16359)

  - Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-16412)

  - Memory safety bugs present in Firefox ESR 115.37, Firefox ESR 140.12 and Firefox 152. Some of these bugs     showed evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-16360)

  - Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12. Some of these bugs showed     evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-16361)

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

The version of Firefox ESR installed on the remote Windows host is prior to 140.13. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-70 advisory.

  - We are aware that exploit code for this is public however we are not aware of any attacks in the wild     abusing this flaw. (CVE-2026-15718, CVE-2026-15719)

  - Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox     153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16359)

  - Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of     memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-16412)

  - Memory safety bugs present in Firefox ESR 115.37, Firefox ESR 140.12 and Firefox 152. Some of these bugs     showed evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-16360)

  - Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12. Some of these bugs showed     evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-16361)

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

ID	Name	Product	Family	Severity
328880	Slackware Linux 15.0 / current mozilla-firefox Multiple Vulnerabilities (SSA:2026-202-02)	Nessus	Slackware Local Security Checks	critical
328774	Mozilla Firefox < 153.0	Nessus	MacOS X Local Security Checks	critical
328773	Mozilla Firefox < 153.0	Nessus	Windows	critical
328772	Mozilla Firefox ESR < 140.13	Nessus	MacOS X Local Security Checks	critical
328771	Mozilla Firefox ESR < 140.13	Nessus	Windows	critical

Detections

Analytics

CVE-2026-16362

high

Tenable Plugins

critical

critical

critical

critical

critical