CVE-2026-6758

Description

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

PUBLISHED Reserved 2026-04-21 | Published 2026-04-21 | Updated 2026-04-22 | Assigner mozilla

Product status

Credits

Evyatar Ben Asher, Keane Lucas, Nicholas Carlini, Newton Cheng, Daniel Freeman, Alex Gaynor, and Joel Weinberger using Claude from Anthropic

References

bugzilla.mozilla.org/show_bug.cgi?id=2013619

www.mozilla.org/security/advisories/mfsa2026-30/

www.mozilla.org/security/advisories/mfsa2026-33/

cve.org (CVE-2026-6758)

nvd.nist.gov (CVE-2026-6758)

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