CVE-2026-124861

Summary

A use-after-free flaw in Firefox's cubeb audio/video component allows an attacker to escape the browser sandbox after tricking a user into visiting a malicious site. Successful exploitation could lead to arbitrary code execution with the same privileges as the compromised browser process.

Exploitability

Exploitation requires user interaction (e.g., visiting a crafted webpage) and reliable memory corruption primitives, making it moderately difficult but feasible for skilled attackers targeting Firefox users.

Blast radius

If exploited, attackers could gain full control of the affected application (Firefox or Thunderbird), potentially leading to data theft, lateral movement, or further compromise of the host system.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Upgrade to Firefox 160, Firefox ESR 115.45, Firefox ESR 153.7, Thunderbird 160, or Thunderbird 153.7 immediately.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.