CVE-2026-74973: Vulnerability in Mozilla Firefox
Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
AI Analysis
Technical Summary
CVE-2026-74973 is a use-after-free and race condition vulnerability found in the Graphics component of Mozilla Firefox. Such vulnerabilities can cause memory corruption, potentially leading to privilege escalation or arbitrary code execution. Mozilla fixed this vulnerability in Firefox 154 and Firefox ESR versions 115.39, 140.14, and 153.1 as part of a broader security update addressing multiple high-impact bugs. The vendor advisories confirm the fix and provide detailed references to the underlying bugs.
Potential Impact
The vulnerability poses a high security impact due to the potential for memory corruption in the Graphics component, which could be exploited to escalate privileges or execute arbitrary code. However, no known exploits in the wild have been reported. The fix in the specified Firefox versions mitigates this risk.
Mitigation Recommendations
Users and administrators should update to Firefox 154 or Firefox ESR versions 115.39, 140.14, or 153.1 to remediate this vulnerability. These versions contain the official fixes provided by Mozilla. No additional mitigation steps are required beyond applying these updates.
CVE-2026-74973: Vulnerability in Mozilla Firefox
Description
Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
CVSS v3.1
Score 4.2medium
Affected software
pkg:github/mozilla/firefox-esrRun 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
CVE-2026-74973 is a use-after-free and race condition vulnerability found in the Graphics component of Mozilla Firefox. Such vulnerabilities can cause memory corruption, potentially leading to privilege escalation or arbitrary code execution. Mozilla fixed this vulnerability in Firefox 154 and Firefox ESR versions 115.39, 140.14, and 153.1 as part of a broader security update addressing multiple high-impact bugs. The vendor advisories confirm the fix and provide detailed references to the underlying bugs.
Potential Impact
The vulnerability poses a high security impact due to the potential for memory corruption in the Graphics component, which could be exploited to escalate privileges or execute arbitrary code. However, no known exploits in the wild have been reported. The fix in the specified Firefox versions mitigates this risk.
Mitigation Recommendations
Users and administrators should update to Firefox 154 or Firefox ESR versions 115.39, 140.14, or 153.1 to remediate this vulnerability. These versions contain the official fixes provided by Mozilla. No additional mitigation steps are required beyond applying these updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-08-17T11:58:50.482Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-74/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-75/","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: 6a84550bc6e8be03323676ae
Added to database: 08/18/2026, 12:50:19 UTC
Last enriched: 08/18/2026, 13:26:02 UTC
Last updated: 08/18/2026, 19:05:04 UTC
Views: 2
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