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Firefox v147.0.3 Addresses Critical Heap Buffer Overflow Vulnerability

First seen 17 Feb 2026, 12:10 UTC • Gbhackers

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Mozilla has released Firefox version 147.0.3 to fix a critical heap buffer overflow vulnerability in the browser’s media processing library. This flaw could allow attackers to execute arbitrary code, impacting both desktop and Extended Support Release (ESR) versions of Firefox. The update is part of Mozilla Foundation Security Advisory 2026-10.

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2026-02-17

Firefox version 147.0.3 released with critical fix

2026-02-17

Mozilla Foundation Security Advisory 2026-10 published

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Firefox v147.0.3 Addresses Critical Heap Buffer Overflow Vulnerability

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