CVE-2026-8389
Description
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
JIT miscompilation in Firefox's JavaScript Engine could allow arbitrary code execution; fixed in Firefox 150.0.3.
CVE-2026-8389 is a JIT miscompilation vulnerability in the JavaScript Engine: JIT component of Mozilla Firefox. The flaw arises from incorrect compilation logic in the Just-In-Time (JIT) compiler, potentially leading to memory corruption or unexpected behavior [1].
Exploitation of this vulnerability requires no user authentication and can be triggered remotely by visiting a malicious webpage. The attacker needs no special network position, as the vulnerability is accessible through standard web content [1].
Successful exploitation could allow an attacker to execute arbitrary code on the victim's system, with impact rated as high by Mozilla. The vulnerability was reported by researcher ggwhyp [1].
Mozilla addressed this issue in Firefox 150.0.3, released on May 12, 2026. Users are advised to update their browsers to the latest version to mitigate the risk [1].
AI Insight generated on May 18, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Patches
0No patches discovered yet.
Vulnerability mechanics
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References
2- www.mozilla.org/security/advisories/mfsa2026-45/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
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