CVE-2026-74964: Vulnerability in Mozilla Firefox
An integer overflow vulnerability exists in the Graphics component of Mozilla Firefox. This vulnerability has been fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. The vulnerability is rated critical with a CVSS score of 9.8. The vendor advisory confirms the availability of official fixes in the specified versions.
AI Analysis
Technical Summary
CVE-2026-74964 is an integer overflow vulnerability in the Graphics component of Mozilla Firefox. This flaw could potentially lead to severe impacts including confidentiality, integrity, and availability compromises. Mozilla has addressed this vulnerability by releasing patches in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. The CVSS v3.1 base score is 9.8, indicating a critical severity level with network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
The vulnerability has a critical impact, potentially allowing an attacker to cause significant compromise of confidentiality, integrity, and availability in affected Firefox versions. The CVSS score of 9.8 reflects the high severity and ease of exploitation without privileges or user interaction.
Mitigation Recommendations
Official patches are available and have been released by Mozilla in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. Users and administrators should update to these fixed versions to remediate the vulnerability. No additional mitigation actions are required beyond applying the official updates.
CVE-2026-74964: Vulnerability in Mozilla Firefox
Description
An integer overflow vulnerability exists in the Graphics component of Mozilla Firefox. This vulnerability has been fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. The vulnerability is rated critical with a CVSS score of 9.8. The vendor advisory confirms the availability of official fixes in the specified versions.
CVSS v3.1
Score 9.8critical
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-74964 is an integer overflow vulnerability in the Graphics component of Mozilla Firefox. This flaw could potentially lead to severe impacts including confidentiality, integrity, and availability compromises. Mozilla has addressed this vulnerability by releasing patches in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. The CVSS v3.1 base score is 9.8, indicating a critical severity level with network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
The vulnerability has a critical impact, potentially allowing an attacker to cause significant compromise of confidentiality, integrity, and availability in affected Firefox versions. The CVSS score of 9.8 reflects the high severity and ease of exploitation without privileges or user interaction.
Mitigation Recommendations
Official patches are available and have been released by Mozilla in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1. Users and administrators should update to these fixed versions to remediate the vulnerability. No additional mitigation actions are required beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-08-17T11:58:31.172Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-76/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-77/","vendor":"Mozilla"}]
Threat ID: 6a845509c6e8be0332367435
Added to database: 08/18/2026, 12:50:17 UTC
Last enriched: 09/11/2026, 21:49:01 UTC
Last updated: 10/02/2026, 02:46:06 UTC
Views: 76
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