Mozjs52: Incorrect boundary conditions in the DOM: Editor component. (CVE-2026-109754)
Description
CVE-2026-109754 is a vulnerability involving incorrect boundary conditions in the DOM Editor component of mozjs52. This issue was addressed and fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. The vulnerability has a CVSS score of 8.1, indicating a high severity level with potential for high confidentiality and integrity impact. No known exploits in the wild have been reported. A comprehensive vendor advisory from Mozilla confirms the fix availability.
CVSS v3.1
Score 8.1high
Affected software
pkg:deb/ubuntu/mozjs52?arch=source&distro=bionicpkg:deb/ubuntu/mozjs38?arch=source&distro=bionicpkg:deb/ubuntu/mozjs68?arch=source&distro=focalpkg:deb/ubuntu/mozjs52?arch=source&distro=focalpkg:deb/ubuntu/mozjs102?arch=source&distro=jammypkg:deb/ubuntu/mozjs78?arch=source&distro=jammypkg:deb/ubuntu/mozjs91?arch=source&distro=jammypkg:deb/ubuntu/thunderbird?arch=source&distro=jammypkg:deb/ubuntu/mozjs102?arch=source&distro=noblepkg:deb/ubuntu/mozjs115?arch=source&distro=nobleRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-109754 affects the mozjs52 JavaScript engine component related to the DOM Editor. It is caused by incorrect boundary conditions that could potentially lead to security issues. Mozilla fixed this vulnerability in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. The CVSS v3.1 score is 8.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, and high impact on confidentiality and integrity but no impact on availability. The vendor advisory explicitly states the fix is included in Firefox 158 and related versions.
Potential Impact
The vulnerability allows an attacker to potentially compromise confidentiality and integrity of the affected software due to incorrect boundary conditions in the DOM Editor component. The CVSS score of 8.1 indicates a high severity impact. However, there are no known exploits in the wild reported at this time.
Mitigation Recommendations
A fix for this vulnerability is available and has been incorporated in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. Users and administrators should update to these versions or later to remediate the vulnerability. No additional mitigation actions are specified by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-109754
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ada44ff4d27ba8daa6a5ae1
Added to database: 10/22/2026, 17:16:47 UTC
Last enriched: 10/22/2026, 17:37:40 UTC
Last updated: 10/22/2026, 17:37:40 UTC
Views: 2
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