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High 7.5Published Mar 24, 2026
CVE-2026-4684Race condition, use-after-free in the Graphics: WebRender component
Updated under an hour ago ()
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It affects Mozilla Firefox and 9 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Race condition, use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416, CWE-362, CWE-364
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mozilla
- NVD analysis
- Modified
- Record last updated
- Jul 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Mozilla Firefox mozilla:firefox (from the name) | 115.34 builds before 115.* not affected; 140.9 builds before 140.* not affected; from 149 not affected | CNA record |
Mozilla Thunderbird mozilla:thunderbird (from the name) | 140.9 builds before 140.* not affected; from 149 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:140.9.0-1.el10_1 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:140.9.0-1.el10_0 not affected | CISA ADP |
from 0:140.9.0-1.el7_9 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_aus | from 0:140.9.0-1.el8_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 0:140.9.0-1.el8_4 not affected | CISA ADP |
from 0:140.9.0-1.el8_6 not affected | CISA ADP | |
from 0:140.9.0-1.el8_6 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus | from 0:140.9.0-1.el9_4 not affected | CISA ADP |
mozilla firefox mozilla:firefox | before 115.34.0; before 149.0; from 128.0 before 140.9.0 | NVD |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2011129permissions-required
- https://www.mozilla.org/security/advisories/mfsa2026-20/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-21/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-22/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-23/
- https://www.mozilla.org/security/advisories/mfsa2026-24/
- https://access.redhat.com/errata/RHSA-2026:5930
- https://access.redhat.com/errata/RHSA-2026:5931
- https://access.redhat.com/errata/RHSA-2026:5932
- https://access.redhat.com/errata/RHSA-2026:6188
- https://access.redhat.com/errata/RHSA-2026:6342
- https://access.redhat.com/errata/RHSA-2026:6917
- https://access.redhat.com/errata/RHSA-2026:7837
- https://access.redhat.com/errata/RHSA-2026:7838
- https://access.redhat.com/errata/RHSA-2026:7839
- https://access.redhat.com/errata/RHSA-2026:7840
- https://access.redhat.com/errata/RHSA-2026:7841
- https://access.redhat.com/errata/RHSA-2026:7842
- https://access.redhat.com/errata/RHSA-2026:7843
- https://access.redhat.com/errata/RHSA-2026:7845
- https://access.redhat.com/errata/RHSA-2026:7858
- https://access.redhat.com/errata/RHSA-2026:8284
- https://access.redhat.com/errata/RHSA-2026:8285
- https://access.redhat.com/errata/RHSA-2026:8286
- https://access.redhat.com/errata/RHSA-2026:8287
The CVE record on cve.org NVD's entry
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