CVE-2025-5269: Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11
Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 128.11 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 128.11 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 128.11
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-5269?
CVE-2025-5269 is classified as a memory safety bug that could potentially lead to arbitrary code execution.
How do I fix CVE-2025-5269?
To fix CVE-2025-5269, update to Firefox ESR version 128.11 or later.
Which software is affected by CVE-2025-5269?
CVE-2025-5269 affects Firefox ESR version 128.10 and Thunderbird version 128.10.
Can CVE-2025-5269 be exploited?
There is evidence that CVE-2025-5269 could be exploited to run arbitrary code with enough effort.
What are the potential consequences of CVE-2025-5269?
The consequences of CVE-2025-5269 include possible memory corruption and exploitation leading to unauthorized code execution.