CVE-2026-16361: Vulnerability in Mozilla Firefox
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. This vulnerability was fixed in Firefox ESR 115.38 and Firefox ESR 140.13.
AI Analysis
Technical Summary
CVE-2026-16361 describes memory safety vulnerabilities in Mozilla Firefox ESR 115.37 and 140.12. These bugs involve memory corruption issues that could allow an attacker, with sufficient effort, to execute arbitrary code. Mozilla addressed these issues by releasing fixed versions Firefox ESR 115.38 and 140.13. The vulnerabilities were discovered and reported by the Mozilla Fuzzing Team. No active exploitation has been observed. The fixes are part of broader security updates addressing multiple high-impact vulnerabilities in Firefox ESR.
Potential Impact
The vulnerabilities could allow remote attackers to exploit memory corruption bugs to run arbitrary code within the context of the affected Firefox ESR versions. This could lead to compromise of the user's system or data if exploited. However, there are no known attacks in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for these vulnerabilities in Firefox ESR versions 115.38 and 140.13. Users and administrators should update affected Firefox ESR installations to these or later versions to remediate the issue. Patch status is confirmed by the vendor advisories. No additional mitigation actions are indicated beyond applying the official updates.
CVE-2026-16361: Vulnerability in Mozilla Firefox
Description
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. This vulnerability was fixed in Firefox ESR 115.38 and Firefox ESR 140.13.
CVSS v3.1
Score 9.8critical
Affected software
pkg:github/mozilla/firefoxRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-16361 describes memory safety vulnerabilities in Mozilla Firefox ESR 115.37 and 140.12. These bugs involve memory corruption issues that could allow an attacker, with sufficient effort, to execute arbitrary code. Mozilla addressed these issues by releasing fixed versions Firefox ESR 115.38 and 140.13. The vulnerabilities were discovered and reported by the Mozilla Fuzzing Team. No active exploitation has been observed. The fixes are part of broader security updates addressing multiple high-impact vulnerabilities in Firefox ESR.
Potential Impact
The vulnerabilities could allow remote attackers to exploit memory corruption bugs to run arbitrary code within the context of the affected Firefox ESR versions. This could lead to compromise of the user's system or data if exploited. However, there are no known attacks in the wild at this time.
Mitigation Recommendations
Mozilla has released official fixes for these vulnerabilities in Firefox ESR versions 115.38 and 140.13. Users and administrators should update affected Firefox ESR installations to these or later versions to remediate the issue. Patch status is confirmed by the vendor advisories. No additional mitigation actions are indicated beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-07-20T21:56:10.203Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-69/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-70/","vendor":"Mozilla"}]
Threat ID: 6a5f6cbb2a4a8d5989262503
Added to database: 07/21/2026, 12:57:31 UTC
Last enriched: 07/21/2026, 13:42:44 UTC
Last updated: 07/21/2026, 22:51:54 UTC
Views: 5
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