CVE-2026-74969: Vulnerability in Mozilla Firefox
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.
AI Analysis
Technical Summary
CVE-2026-74969 is a use-after-free vulnerability affecting the Layout: Text and Fonts component in Mozilla Firefox. Use-after-free vulnerabilities occur when a program continues to use a pointer after the memory it points to has been freed, potentially leading to memory corruption 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 security update addressing multiple high and moderate impact bugs. The vendor advisory indicates the vulnerability was reported by Hyeonjun Ahn and is considered to have moderate impact.
Potential Impact
The vulnerability could allow an attacker to exploit memory corruption in the Layout: Text and Fonts component, potentially leading to security issues such as privilege escalation or arbitrary code execution. However, no known exploits in the wild have been reported. The impact is assessed as moderate by the vendor.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 154 and Firefox ESR versions 115.39, 140.14, and 153.1. Users and administrators should update to these versions or later to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-74969: Vulnerability in Mozilla Firefox
Description
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-74969 is a use-after-free vulnerability affecting the Layout: Text and Fonts component in Mozilla Firefox. Use-after-free vulnerabilities occur when a program continues to use a pointer after the memory it points to has been freed, potentially leading to memory corruption 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 security update addressing multiple high and moderate impact bugs. The vendor advisory indicates the vulnerability was reported by Hyeonjun Ahn and is considered to have moderate impact.
Potential Impact
The vulnerability could allow an attacker to exploit memory corruption in the Layout: Text and Fonts component, potentially leading to security issues such as privilege escalation or arbitrary code execution. However, no known exploits in the wild have been reported. The impact is assessed as moderate by the vendor.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 154 and Firefox ESR versions 115.39, 140.14, and 153.1. Users and administrators should update to these versions or later to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-08-17T11:58:42.345Z
- 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: 6a845509c6e8be033236744c
Added to database: 08/18/2026, 12:50:17 UTC
Last enriched: 08/18/2026, 13:26:34 UTC
Last updated: 08/18/2026, 13:37:35 UTC
Views: 3
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