CVE-2023-4577

When `UpdateRegExpStatics` attempted to access `initialStringHeap` it could already have been garbage collected prior to entering the function, which could potentially have led to an exploitable crash. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1847397Issue Tracking, Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2023-34/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-36/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-38/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1847397Issue Tracking, Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2023-34/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-36/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-38/Vendor Advisory

Published

Sep 11, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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