CVE-2026-8390

Use-after-free in the JavaScript: WebAssembly component

CVSS 7.3 HIGHEPSS 0.3%CWE-416 CWE-825

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.3EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

12 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

Mozilla · Firefox

References

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