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High 8.8Published Feb 24, 2026
CVE-2026-2767Use-after-free in the JavaScript: WebAssembly 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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Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVSS
- 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- 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) | 140.8 builds before 140.* not affected; from 148 not affected | CNA record |
Mozilla Thunderbird mozilla:thunderbird (from the name) | 140.8 builds before 140.* not affected; from 148 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:140.8.0-2.el10_1 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:140.8.0-2.el10_0 not affected | CISA ADP |
from 0:140.8.0-2.el7_9 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_aus | from 0:140.8.0-2.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 0:140.8.0-2.el8_4 not affected | CISA ADP |
from 0:140.8.0-2.el8_6 not affected | CISA ADP | |
from 0:140.8.0-2.el8_6 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus | from 0:140.8.0-2.el9_4 not affected | CISA ADP |
mozilla firefox mozilla:firefox | before 140.8.0; before 148.0 | NVD |
mozilla thunderbird mozilla:thunderbird | before 140.8.0; before 148.0 | NVD |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2013741issue-tracking, permissions-required
- https://www.mozilla.org/security/advisories/mfsa2026-13/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-15/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-17/vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3338
- https://access.redhat.com/errata/RHSA-2026:3339
- https://access.redhat.com/errata/RHSA-2026:3361
- https://access.redhat.com/errata/RHSA-2026:3491
- https://access.redhat.com/errata/RHSA-2026:3492
- https://access.redhat.com/errata/RHSA-2026:3493
- https://access.redhat.com/errata/RHSA-2026:3494
- https://access.redhat.com/errata/RHSA-2026:3495
- https://access.redhat.com/errata/RHSA-2026:3496
- https://access.redhat.com/errata/RHSA-2026:3497
- https://access.redhat.com/errata/RHSA-2026:3515
- https://access.redhat.com/errata/RHSA-2026:3516
- https://access.redhat.com/errata/RHSA-2026:3517
- https://access.redhat.com/errata/RHSA-2026:3976
- https://access.redhat.com/errata/RHSA-2026:3978
- https://access.redhat.com/errata/RHSA-2026:3979
- https://access.redhat.com/errata/RHSA-2026:3980
- https://access.redhat.com/errata/RHSA-2026:3981
- https://access.redhat.com/errata/RHSA-2026:3982
- https://access.redhat.com/errata/RHSA-2026:3983
The CVE record on cve.org NVD's entry
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