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Fencer Intel
high 8.8

CVE-2026-92052 json

Privilege escalation due to uninitialized memory in the Graphics: CanvasWebGL component

published last mo. modified last mo. also EUVD-2026-78515

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

Privilege escalation due to uninitialized memory in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Patch / fix

  • mozilla firefox 153.3, 156
  • mozilla firefox_esr 153.3, 156
  • mozilla thunderbird 153.3, 156
  • mozilla thunderbird_esr 153.3, 156
  • thunderbird Debian 14 1:153.3.0esr-1

debian advisories DEBIAN-CVE-2026-92052

  • MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 153.4.0-150400.13.6.1
  • MozillaFirefox SLES for SAP applications 16.0, SLES 16.0 153.3.0-160000.1.1
  • MozillaFirefox SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 153.3.0-150400.157.8.1
  • MozillaFirefox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 153.3.0-118.8.1

suse advisories SUSE-SU-2026:4627-1SUSE-SU-2026:23918-1SUSE-SU-2026:4264-1SUSE-SU-2026:4247-1

  • MozillaThunderbird openSUSE Tumbleweed 153.4.0-1.1
  • MozillaFirefox openSUSE Leap 16.0 153.3.0-160000.1.1
  • MozillaFirefox openSUSE Tumbleweed 156.0-1.1
  • firefox-esr openSUSE Tumbleweed 153.3.0-1.1

opensuse advisories openSUSE-SU-2026:12098-1openSUSE-SU-2026:21951-1openSUSE-SU-2026:11826-1openSUSE-SU-2026:11796-1

Is CVE-2026-92052 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2026-92052 updated cvss 6.1

firefox: thunderbird: Privilege escalation due to uninitialized memory in the Graphics: CanvasWebGL component

  • Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 firefox, thunderbird Red Hat Enterprise Linux 8 firefox, thunderbird Red Hat Enterprise Linux 9 firefox, firefox-x11, thunderbird Red Hat Enterprise Linux 10 firefox, thunderbird, rhel10/firefox-flatpak, rhel10/thunderbird-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
no
Technical impact
total
Assessed
last mo.

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Firefox
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-457 Use of Uninitialized Variable

References

Sources

Fencer Intel 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.