VulnerabilityModified
CVE-2026-8390
Use-after-free in the JavaScript: WebAssembly component.
HIGH 7.3EPSS 0.50%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.
- CVSS 3.1
- 7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- EPSS
- 0.50% probability · 41th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-825
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2038081Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-45/Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-8390
- https://bugzilla.redhat.com/show_bug.cgi?id=2476474
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8390.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.