CVE-2026-84141: Vulnerability in Mozilla Firefox
Description
Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVSS v3.1
Score 9.8critical
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-84141 is an integer overflow vulnerability located in the Graphics: ImageLib component of Mozilla Firefox. The flaw could potentially lead to memory corruption or other security-relevant defects. Mozilla fixed this vulnerability in Firefox 155 and Firefox ESR 153.2 as part of a broader security update addressing multiple internally found bugs. The CVSS 3.1 base score is 9.8, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
The vulnerability allows an attacker to cause an integer overflow in the graphics processing component, which could lead to memory corruption and potentially allow execution of arbitrary code or denial of service. The CVSS score of 9.8 indicates critical severity with high impact on confidentiality, integrity, and availability. However, there are no known exploits in the wild at the time of publication.
Mitigation Recommendations
This vulnerability has been fixed in Firefox 155 and Firefox ESR 153.2. Users and administrators should update to these versions or later to mitigate the risk. Since this is not a cloud service, remediation depends on applying the official vendor patches. Patch status is confirmed by Mozilla advisories MFSA2026-82 and MFSA2026-85.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-01T07:25:58.726Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-82/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-85/","vendor":"Mozilla"}]
Threat ID: 6a96cab4acd9273b49b685a7
Added to database: 09/01/2026, 12:53:08 UTC
Last enriched: 09/07/2026, 12:59:58 UTC
Last updated: 10/16/2026, 18:48:25 UTC
Views: 58
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