critical
CVE-2026-2763
firefox: thunderbird: Use-after-free in the JavaScript Engine component
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high), AlmaLinux (high), Amazon (high), Oracle (high), Rocky Linux (high), Ubuntu (medium).
Description
Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| alma 8 | firefox, thunderbird | 140.8.0-2.el8_10.alma.1 and 1 more |
| alma 9 | firefox, firefox-x11, thunderbird | 140.8.0-2.el9_7.alma.1 and 1 more |
| amazon linux 2 | thunderbird | 140.8.0-1.amzn2.0.1 |
| amazon linux 2023 | firefox, firefox-debuginfo, firefox-debugsource | 140.8.0-1.amzn2023.0.1 |
| chainguard | firefox, firefox-esr | 148.0-r0 and 1 more |
| debian 11 | firefox-esr, thunderbird | 140.8.0esr-1~deb11u1 and 1 more |
| debian 12 | firefox-esr, thunderbird | 140.8.0esr-1~deb12u1 and 1 more |
| debian 13 | firefox-esr, thunderbird | 140.8.0esr-1~deb13u1 and 1 more |
| debian 14 | firefox-esr, thunderbird | 140.8.0esr-1 and 1 more |
| echo | firefox-esr, thunderbird | 140.8.0esr-1~deb12u1 and 1 more |
| Oracle Linux 7 | firefox | 140.8.0-2.0.1.el7_9 |
| Oracle Linux 8 | firefox, thunderbird | 140.8.0-2.0.1.el8_10 and 1 more |
Show all 63 entries from 33 sources
| Source | Package | Fixed in |
|---|---|---|
| alma 8 | firefox | 140.8.0-2.el8_10.alma.1 |
| alma 8 | thunderbird | 140.8.0-1.el8_10.alma.1 |
| alma 9 | firefox | 140.8.0-2.el9_7.alma.1 |
| alma 9 | firefox-x11 | 140.8.0-2.el9_7.alma.1 |
| alma 9 | thunderbird | 140.8.0-1.el9_7.alma.1 |
| amazon linux 2 | thunderbird | 140.8.0-1.amzn2.0.1 |
| amazon linux 2023 | firefox | 140.8.0-1.amzn2023.0.1 |
| amazon linux 2023 | firefox-debuginfo | 140.8.0-1.amzn2023.0.1 |
| amazon linux 2023 | firefox-debugsource | 140.8.0-1.amzn2023.0.1 |
| chainguard | firefox | 148.0-r0 |
| chainguard | firefox-esr | 140.8.0-r0 |
| debian 11 | firefox-esr | 140.8.0esr-1~deb11u1 |
| debian 11 | thunderbird | 1:140.8.0esr-1~deb11u1 |
| debian 12 | firefox-esr | 140.8.0esr-1~deb12u1 |
| debian 12 | thunderbird | 1:140.8.0esr-1~deb12u1 |
| debian 13 | firefox-esr | 140.8.0esr-1~deb13u1 |
| debian 13 | thunderbird | 1:140.8.0esr-1~deb13u1 |
| debian 14 | firefox-esr | 140.8.0esr-1 |
| debian 14 | thunderbird | 1:140.8.0esr-1 |
| echo | firefox-esr | 140.8.0esr-1~deb12u1 |
| echo | thunderbird | 1:140.8.0esr-1~deb12u1 |
| Oracle Linux 7 | firefox | 140.8.0-2.0.1.el7_9 |
| Oracle Linux 8 | firefox | 140.8.0-2.0.1.el8_10 |
| Oracle Linux 8 | thunderbird | 140.8.0-1.0.1.el8_10 |
| Oracle Linux 9 | firefox | 140.8.0-2.0.1.el9_7 |
| Oracle Linux 9 | firefox-x11 | 140.8.0-2.0.1.el9_7 |
| Oracle Linux 9 | thunderbird | 140.8.0-1.0.1.el9_7 |
| rapidfort alpine 3.20 | firefox | 142.0-r0 |
| rapidfort alpine 3.20 | thunderbird | 144.0-r0 |
| rapidfort alpine 3.21 | firefox | 142.0-r0 |
| rapidfort alpine 3.21 | thunderbird | 144.0-r0 |
| rapidfort alpine 3.22 | firefox | 142.0-r0 |
| rapidfort alpine 3.22 | thunderbird | 144.0-r0 |
| rapidfort alpine 3.23 | thunderbird | 144.0-r0 |
| rapidfort alpine 3.24 | firefox | 142.0-r0 |
| rapidfort amazon linux 2023 | firefox | 140.8.0-1.amzn2023.0.1 |
| rapidfort debian 12 | firefox-esr | 0:140.8.0esr-1, 0:140.8.0esr-1~deb11u1, 0:140.8.0esr-1~deb12u1, 0:140.8.0esr-1~deb13u1 |
| rapidfort debian 12 | thunderbird | 0:140.8.0esr-1~deb11u1, 0:140.8.0esr-1~deb12u1, 0:140.8.0esr-1~deb13u1, 1:140.8.0esr-1 |
| rapidfort debian 13 | firefox-esr | 0:140.8.0esr-1, 0:140.8.0esr-1~deb11u1, 0:140.8.0esr-1~deb12u1, 0:140.8.0esr-1~deb13u1 |
| rapidfort debian 13 | thunderbird | 0:140.8.0esr-1~deb11u1, 0:140.8.0esr-1~deb12u1, 0:140.8.0esr-1~deb13u1, 1:140.8.0esr-1 |
| rapidfort fedora 43 | firefox | 148.0.2-1.fc43 |
| rapidfort fedora 43 | firefox-langpacks | 148.0.2-1.fc43 |
| rapidfort fedora 43 | thunderbird | 145.0-1.fc43 |
| rapidfort fedora 43 | thunderbird-librnp-rnp | 145.0-1.fc43 |
| rapidfort Oracle Linux 10 | firefox | 0:140.8.0-2.0.1.el10_1 |
| rapidfort Oracle Linux 10 | thunderbird | 0:140.8.0-2.0.1.el10_1 |
| rapidfort Oracle Linux 9 | firefox | 0:140.8.0-2.0.1.el9_7 |
| rapidfort Oracle Linux 9 | firefox-x11 | 0:140.8.0-2.0.1.el9_7 |
| rapidfort Oracle Linux 9 | thunderbird | 0:140.8.0-1.0.1.el9_7 |
| rapidfort ubuntu 20.04 | thunderbird | no fix listed |
| rapidfort ubuntu 22.04 | thunderbird | no fix listed |
| rapidfort ubuntu 24.04 | thunderbird | no fix listed |
| Red Hat | firefox | no fix listed |
| Red Hat | thunderbird | no fix listed |
| rocky 10 | firefox | 140.8.0-2.el10_1 |
| rocky 10 | thunderbird | 140.8.0-2.el10_1 |
| rocky 8 | firefox | 140.8.0-2.el8_10 |
| rocky 8 | thunderbird | 140.8.0-1.el8_10 |
| rocky 9 | firefox | 140.8.0-2.el9_7 |
| rocky 9 | firefox-x11 | 140.8.0-2.el9_7 |
| rocky 9 | thunderbird | 140.8.0-1.el9_7 |
| ubuntu 22.04 | thunderbird | no fix listed |
| wolfi | firefox | 148.0-r0 |
References
- 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
All 158 references
- 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
- https://access.redhat.com/errata/RHSA-2026:3984
- https://access.redhat.com/errata/RHSA-2026:4022
- https://access.redhat.com/errata/RHSA-2026:4152
- https://access.redhat.com/errata/RHSA-2026:4260
- https://access.redhat.com/errata/RHSA-2026:4432
- https://access.redhat.com/security/cve/CVE-2026-2763
- https://bugzilla.mozilla.org/show_bug.cgi?id=2012018
- https://bugzilla.redhat.com/2440219
- https://bugzilla.redhat.com/2442284
- https://bugzilla.redhat.com/2442287
- https://bugzilla.redhat.com/2442288
- https://bugzilla.redhat.com/2442290
- https://bugzilla.redhat.com/2442291
- https://bugzilla.redhat.com/2442292
- https://bugzilla.redhat.com/2442294
- https://bugzilla.redhat.com/2442295
- https://bugzilla.redhat.com/2442297
- https://bugzilla.redhat.com/2442298
- https://bugzilla.redhat.com/2442300
- https://bugzilla.redhat.com/2442302
- https://bugzilla.redhat.com/2442304
- https://bugzilla.redhat.com/2442307
- https://bugzilla.redhat.com/2442308
- https://bugzilla.redhat.com/2442309
- https://bugzilla.redhat.com/2442312
- https://bugzilla.redhat.com/2442313
- https://bugzilla.redhat.com/2442314
- https://bugzilla.redhat.com/2442316
- https://bugzilla.redhat.com/2442318
- https://bugzilla.redhat.com/2442319
- https://bugzilla.redhat.com/2442320
- https://bugzilla.redhat.com/2442322
- https://bugzilla.redhat.com/2442324
- https://bugzilla.redhat.com/2442325
- https://bugzilla.redhat.com/2442326
- https://bugzilla.redhat.com/2442327
- https://bugzilla.redhat.com/2442328
- https://bugzilla.redhat.com/2442329
- https://bugzilla.redhat.com/2442331
- https://bugzilla.redhat.com/2442333
- https://bugzilla.redhat.com/2442334
- https://bugzilla.redhat.com/2442335
- https://bugzilla.redhat.com/2442337
- https://bugzilla.redhat.com/2442342
- https://bugzilla.redhat.com/2442343
- https://bugzilla.redhat.com/show_bug.cgi?id=2440219
- https://bugzilla.redhat.com/show_bug.cgi?id=2442284
- https://bugzilla.redhat.com/show_bug.cgi?id=2442287
- https://bugzilla.redhat.com/show_bug.cgi?id=2442288
- https://bugzilla.redhat.com/show_bug.cgi?id=2442290
- https://bugzilla.redhat.com/show_bug.cgi?id=2442291
- https://bugzilla.redhat.com/show_bug.cgi?id=2442292
- https://bugzilla.redhat.com/show_bug.cgi?id=2442294
- https://bugzilla.redhat.com/show_bug.cgi?id=2442295
- https://bugzilla.redhat.com/show_bug.cgi?id=2442297
- https://bugzilla.redhat.com/show_bug.cgi?id=2442298
- https://bugzilla.redhat.com/show_bug.cgi?id=2442300
- https://bugzilla.redhat.com/show_bug.cgi?id=2442302
- https://bugzilla.redhat.com/show_bug.cgi?id=2442304
- https://bugzilla.redhat.com/show_bug.cgi?id=2442307
- https://bugzilla.redhat.com/show_bug.cgi?id=2442308
- https://bugzilla.redhat.com/show_bug.cgi?id=2442309
- https://bugzilla.redhat.com/show_bug.cgi?id=2442312
- https://bugzilla.redhat.com/show_bug.cgi?id=2442313
- https://bugzilla.redhat.com/show_bug.cgi?id=2442314
- https://bugzilla.redhat.com/show_bug.cgi?id=2442316
- https://bugzilla.redhat.com/show_bug.cgi?id=2442318
- https://bugzilla.redhat.com/show_bug.cgi?id=2442319
- https://bugzilla.redhat.com/show_bug.cgi?id=2442320
- https://bugzilla.redhat.com/show_bug.cgi?id=2442322
- https://bugzilla.redhat.com/show_bug.cgi?id=2442324
- https://bugzilla.redhat.com/show_bug.cgi?id=2442325
- https://bugzilla.redhat.com/show_bug.cgi?id=2442326
- https://bugzilla.redhat.com/show_bug.cgi?id=2442327
- https://bugzilla.redhat.com/show_bug.cgi?id=2442328
- https://bugzilla.redhat.com/show_bug.cgi?id=2442329
- https://bugzilla.redhat.com/show_bug.cgi?id=2442331
- https://bugzilla.redhat.com/show_bug.cgi?id=2442333
- https://bugzilla.redhat.com/show_bug.cgi?id=2442334
- https://bugzilla.redhat.com/show_bug.cgi?id=2442335
- https://bugzilla.redhat.com/show_bug.cgi?id=2442337
- https://bugzilla.redhat.com/show_bug.cgi?id=2442342
- https://bugzilla.redhat.com/show_bug.cgi?id=2442343
- https://creativecommons.org/licenses/by/4.0/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2447
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2757
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2758
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2759
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2760
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2761
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2762
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2763
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2764
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2765
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2766
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2767
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2768
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2769
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2770
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2771
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2772
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2773
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2774
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2775
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2776
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2777
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2778
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2779
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2780
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2781
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2782
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2783
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2784
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2785
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2786
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2787
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2788
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2789
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2790
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2791
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2792
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2793
- https://errata.almalinux.org/9/ALSA-2026-3516.html
- https://errata.rockylinux.org/RLSA-2026:3516
- https://linux.oracle.com/cve/CVE-2026-2763.html
- https://linux.oracle.com/errata/ELSA-2026-3984.html
- https://nvd.nist.gov/vuln/detail/CVE-2026-2763
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2763.json
- https://www.cve.org/CVERecord?id=CVE-2026-2763
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2763
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-15/#CVE-2026-2763
- https://www.mozilla.org/security/advisories/mfsa2026-13/
- https://www.mozilla.org/security/advisories/mfsa2026-14/
- https://www.mozilla.org/security/advisories/mfsa2026-15/
- https://www.mozilla.org/security/advisories/mfsa2026-15/#CVE-2026-2763
- https://www.mozilla.org/security/advisories/mfsa2026-16/
- https://www.mozilla.org/security/advisories/mfsa2026-17/
- https://www.mozilla.org/security/advisories/mfsa2026-17/#CVE-2026-2763