CVE-2025-1934: 
NixOS vulnerability analysis and mitigation

CVE-2025-1934 is a security vulnerability discovered in Mozilla products that was disclosed on March 4, 2025. The vulnerability affects Firefox < 136, Firefox ESR < 128.8, Thunderbird < 136, and Thunderbird < 128.8. The issue was reported by security researcher Nils Bars and was assigned a moderate severity rating (Mozilla Advisory).

The vulnerability involves an issue where it was possible to interrupt the processing of a RegExp bailout and run additional JavaScript, potentially triggering garbage collection when the engine was not expecting it. This vulnerability was initially assigned a CVSS v3.1 score with vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N, though this was later removed during reassessment (NVD).

The vulnerability could potentially lead to unexpected behavior in the JavaScript engine when processing regular expressions, specifically during garbage collection operations. While rated as moderate severity, the exact impact potential was significant enough to warrant patches across multiple Mozilla products (Mozilla Advisory).

Mozilla has addressed this vulnerability by releasing security updates: Firefox 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird ESR 128.8. Users are advised to update their installations to these versions or newer to mitigate the vulnerability (Mozilla Advisory).