Memory Safety Vulnerabilities in Firefox and Thunderbird by Mozilla

CVE-2026-5734

What is CVE-2026-5734?

The vulnerability involves memory safety issues in Firefox and Thunderbird. Specifically, certain versions exhibit vulnerabilities tied to memory corruption, which could potentially be exploited to execute arbitrary code. Affected versions include Firefox 149.0.1 and Thunderbird 149.0.1, along with earlier ESR versions. Updating to Firefox 149.0.2 or Thunderbird 149.0.2 is recommended to mitigate these risks. Mozilla has addressed these critical memory safety concerns in their latest security advisories.

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