CVE-2026-16392
published 2026-07-21CVE-2026-16392: JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
PriorityP346critical9.1CVSS 3.1
AVNACLPRNUINSUCNIHAH
EPSS
0.15%
4.7th percentile
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 153 | Firefox 153 |
| mozilla | thunderbird | < Thunderbird 153 | Thunderbird 153 |
| mozilla | thunderbird | — | — |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
vendor_redhat6.1MEDIUM
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Red Hat
firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component
vendor_redhat·2026-07-21·CVSS 6.1
CVE-2026-16392 [MEDIUM] CWE-733 firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component
firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
JIT miscompilation in the JavaScript Engine: JIT component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Fix deferred
Package: firefox (Red Hat Enterprise Linux 6) - Not affected
Package: firefox (Red Hat Enterprise Linux 7) - Not affected
Package: firefox (Red Hat Enterprise Linux 8) - Not affected
Package: thunderb
Mozilla
Mozilla Foundation Security Advisory 2026-68: CVE-2026-16392
vendor_mozilla
CVE-2026-16392 Mozilla Foundation Security Advisory 2026-68: CVE-2026-16392
Mozilla Foundation Security Advisory 2026-68
CVE: CVE-2026-16392
Product: Firefox
Impact: high
Fixed in: Firefox 153
Mozilla
Mozilla Foundation Security Advisory 2026-71: CVE-2026-16392
vendor_mozilla
CVE-2026-16392 Mozilla Foundation Security Advisory 2026-71: CVE-2026-16392
Mozilla Foundation Security Advisory 2026-71
CVE: CVE-2026-16392
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153
GHSA
JIT miscompilation in the JavaScript Engine: JIT component.
ghsa_unreviewed·2026-07-21
CVE-2026-16392 JIT miscompilation in the JavaScript Engine: JIT component.
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153.
No detection rules found.
No public exploits indexed.
2026-07-21
Published