🔐 CVE Alert

CVE-2026-12321

MEDIUM 5.4

JIT miscompilation in the JavaScript: WebAssembly component

CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Jun 16, 2026
Last Updated Jun 16, 2026
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Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2032943 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-57/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-60/

Credits

JunYoung Park