CVE-2026-8390

HIGH 7.3

Use-after-free in the JavaScript: WebAssembly component

CVSS Score

7.3

EPSS Score

0.0%

EPSS Percentile

0th

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	May 12, 2026
Last Updated	Jul 15, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2038081 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-45/ access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-8390 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2476474 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8390.json

Credits

OpenAI Preparedness, Bill Demirkapi