Chrome security update fixes six flaws that could enable arbitrary code execution. Stable channel 139.0.7258.127/.128 (Windows, Mac) and .127 (Linux) ships high-severity patches that protect user data and system integrity.

CVE-2025-8879 is a heap buffer overflow in libaom's video codec. CVE-2025-8880 is a V8 race condition reported by Seunghyun Lee. CVE-2025-8901 is an out-of-bounds write in ANGLE.

Detection methods included AddressSanitizer, MemorySanitizer, UndefinedBehaviorSanitizer, Control Flow Integrity, libFuzzer, and AFL. Further fixes address CVE-2025-8881 in File Picker and CVE-2025-8882, a use-after-free in Aura.

Successful exploitation could allow code to run with browser privileges through overflows and race conditions. The automatic rollout is staged; users should update it manually by going to Settings > About Chrome.

Administrators should prioritise rapid deployment in enterprise fleets. Google credited external researchers, anonymous contributors, and the Big Sleep project for coordinated reporting and early discovery.