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Fencer Vulns
critical 9.1

CVE-2026-16392 json

JIT miscompilation in the JavaScript Engine: JIT component

published 2026-07-21 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-46229

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Patch / fix

  • mozilla firefox 153
  • mozilla firefox_esr 153
  • mozilla thunderbird 153
  • mozilla thunderbird_esr 153
  • MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 153.2.0-150400.13.3.1
  • mozilla-nss SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 3.125-150400.3.74.1
  • mozilla-nspr SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 4.39-150400.12.3.1
  • MozillaFirefox SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 153.2.0-150400.157.5.1
  • MozillaFirefox-branding-SLE SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 153-150400.14.3.1
  • mozilla-nss SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.125-160000.1.1
  • mozilla-nspr SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 4.39-160000.1.1
  • rust-cbindgen SLES for SAP applications 16.0, SLES 16.0 0.29.4+git0-160000.1.1

suse advisories SUSE-SU-2026:4268-1SUSE-SU-2026:4156-1SUSE-SU-2026:4140-1SUSE-SU-2026:23411-1SUSE-SU-2026:23590-1

  • rust-cbindgen openSUSE Leap 16.0 0.29.4+git0-160000.1.1
  • mozilla-nss openSUSE Leap 16.0 3.125-160000.1.1
  • mozilla-nspr openSUSE Leap 16.0 4.39-160000.1.1
  • MozillaFirefox openSUSE Leap 16.0 153.1.0-160000.1.2
  • firefox-esr openSUSE Tumbleweed 153.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 153.0-1.1

opensuse advisories openSUSE-SU-2026:21713-1openSUSE-SU-2026:11373-1openSUSE-SU-2026:11358-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-16392 updated cvss 6.1

firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component

  • Red Hat Enterprise Linux 8 thunderbird, thunderbird 140.12.0-1.el10_0 Red Hat Enterprise Linux 9 thunderbird, thunderbird 140.12.0-1.el10_0 Red Hat Enterprise Linux 10 thunderbird 140.12.0-1.el10_0
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 firefox Red Hat Enterprise Linux 7 firefox Red Hat Enterprise Linux 8 firefox Red Hat Enterprise Linux 9 firefox, firefox-x11 Red Hat Enterprise Linux 10 firefox, rhel10/firefox-flatpak
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

  • Mozilla Firefox
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-670 Always-Incorrect Control Flow Implementation
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.