Bug 2550420 (CVE-2026-109729)

Summary: CVE-2026-109729 firefox: firefox: arbitrary code execution via use-after-free in JIT compiler
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: gotiwari, jhorak, mvyas, rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in firefox. A use-after-free memory vulnerability in the JavaScript Just-In-Time (JIT) engine allows a remote attacker to achieve arbitrary code execution or cause a Denial of Service (DoS). By tricking a user into visiting a malicious webpage, an attacker can exploit incorrect memory handling to compromise the browser process.
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Description OSIDB Bzimport 2026-10-13 12:59:55 UTC
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5.