CVE-2012-1946: Use-after-free vulnerability in the nsINode::ReplaceOrInsertBefore function in Mozilla Firefox 4.x through...

Security readout for executives and security teams

This is a memory safety flaw in older Mozilla products. A malicious web page or document content could trigger unsafe node replacement or insertion and may execute code in the affected application. The issue is historical, but it remains business-relevant where legacy Firefox, Thunderbird, SeaMonkey, or old packaged builds still exist. Exposure is most likely on endpoints running legacy Mozilla browsers or mail clients, including distribution-packaged builds referenced by Red Hat, Mandriva, and SUSE advisories. Modern supported versions are not identified as affected in the supplied bundle. Asset inventory should focus on old desktop images, archived systems, and unsupported Linux packages. Treat as high priority only where legacy Mozilla software remains in use. The impact is serious, but the CVE is from 2012 and the bundle provides no active exploitation evidence. The practical risk is concentrated in unsupported endpoints and stale gold images. Mitigation focus: Update affected Mozilla products to versions outside the listed vulnerable ranges.; Prioritize removal of unsupported Firefox, Thunderbird, and SeaMonkey builds.; Check vendor and distribution advisories for exact package names and fixed builds..

Prepared

Jun 24, 2026, 12:34 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.