CVE-2026-12298 json
Memory safety bug fixed in Thunderbird 152
published 2026-06-16 4 mo ago modified 2026-10-26 14 d ago also EUVD-2026-37089
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 23%
- public exploits
- 0
- none known
Summary
Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Patch / fix
- Red Hat Red Hat Enterprise Linux 10 0:140.12.0-1.el10_2
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:140.12.0-1.el10_0
- Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:140.12.0-1.el7_9
- Red Hat Red Hat Enterprise Linux 8 0:140.12.0-1.el8_10
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:140.12.0-1.el8_4
- Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:140.12.0-1.el8_4
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:140.12.0-1.el8_6
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:140.12.0-1.el8_6
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:140.12.0-1.el8_8
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:140.12.0-1.el8_8
- Red Hat Red Hat Enterprise Linux 9 0:140.12.0-1.el9_8
- Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:140.12.0-1.el9_2
- Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:140.12.0-1.el9_4
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:140.12.0-1.el9_6
- firefox-esr Debian 12 140.12.0esr-1~deb12u1
- firefox-esr Debian 13 140.12.0esr-1~deb13u1
- firefox-esr Debian 14 140.12.0esr-1
- thunderbird Debian 12 1:140.12.0esr-1~deb12u1
- thunderbird Debian 13 1:140.12.0esr-1~deb13u1
- thunderbird Debian 14 1:140.12.0esr-1
debian advisories DEBIAN-CVE-2026-12298
- thunderbird RHEL 8 140.12.0-1.el8_10
- thunderbird RHEL 10.2 140.12.0-1.el10_2
- thunderbird RHEL 9 140.12.0-1.el9_8
- firefox RHEL 9 140.12.0-1.el9_8
- firefox-x11 RHEL 9 140.12.0-1.el9_8
- firefox RHEL 10.2 140.12.0-1.el10_2
- firefox RHEL 8 140.12.0-1.el8_10
- thunderbird RHEL 9.2 E4S 140.12.0-1.el9_2
red hat advisories RHSA-2026:39706RHSA-2026:39428RHSA-2026:39142RHSA-2026:39141RHSA-2026:39011RHSA-2026:38751
- MozillaFirefox SLES 16.0, SLES for SAP applications 16.0 140.13.0-160000.1.1
- MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 140.12.0-150200.8.277.1
- MozillaFirefox SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 140.12.0-150200.152.245.1
- MozillaFirefox SLES for SAP applications 16.0, SLES 16.0 140.12.0-160000.1.1
- MozillaFirefox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 140.12.0-112.321.1
suse advisories SUSE-SU-2026:23115-1SUSE-SU-2026:23137-1SUSE-SU-2026:2852-1SUSE-SU-2026:2814-1SUSE-SU-2026:22351-1SUSE-SU-2026:2583-1
- MozillaFirefox openSUSE Leap 16.0 140.13.0-160000.1.1
- MozillaThunderbird openSUSE Leap 16.0 140.12.0-bp160.1.1
- MozillaFirefox openSUSE Leap 16.0 140.12.0-160000.1.1
- MozillaThunderbird openSUSE Tumbleweed 140.12.0-1.1
- MozillaFirefox openSUSE Tumbleweed 152.0-1.1
- firefox-esr openSUSE Tumbleweed 140.12.0-1.1
opensuse advisories openSUSE-SU-2026:21519-1openSUSE-SU-2026:21168-1openSUSE-SU-2026:21043-1openSUSE-SU-2026:11072-1openSUSE-SU-2026:11052-1openSUSE-SU-2026:11055-1
- thunderbird AlmaLinux 8 140.12.0-1.el8_10.alma.1
- thunderbird AlmaLinux 10 140.12.0-1.el10_2.alma.1
- thunderbird AlmaLinux 9 140.12.0-1.el9_8.alma.1
- firefox AlmaLinux 8 140.12.0-1.el8_10.alma.1
- firefox AlmaLinux 10 140.12.0-1.el10_2
- firefox AlmaLinux 9 140.12.0-1.el9_8.alma.1
- firefox-x11 AlmaLinux 9 140.12.0-1.el9_8.alma.1
almalinux advisories ALSA-2026:33445ALSA-2026:30846ALSA-2026:29940ALSA-2026:27717ALSA-2026:27733ALSA-2026:27734
- thunderbird Rocky Linux 10 140.12.0-1.el10_2
- thunderbird Rocky Linux 8 140.12.0-1.el8_10
- thunderbird Rocky Linux 9 140.12.0-1.el9_8
- firefox Rocky Linux 8 140.12.0-1.el8_10
- firefox Rocky Linux 10 140.12.0-1.el10_2
- firefox Rocky Linux 9 140.12.0-1.el9_8
rocky linux advisories RLSA-2026:30846RLSA-2026:33445RLSA-2026:29940RLSA-2026:27717RLSA-2026:27733RLSA-2026:27734
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-2026-12298 updated cvss 7.5
firefox: thunderbird: Memory safety bug fixed in Firefox ESR 140.12
-
Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbirdaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 10 rhel10/firefox-flatpak, rhel10/thunderbird-flatpakaffected: no fix available
-
Red Hat Enterprise Linux AppStream (v. 8) firefox 140.12.0-1.el8_10, thunderbird 140.12.0-1.el8_10fixed: vendor fix RHSA-2026:27717
-
Red Hat Enterprise Linux AppStream (v. 9) firefox 140.12.0-1.el9_8, firefox-x11 140.12.0-1.el9_8, thunderbird 140.12.0-1.el9_8fixed: vendor fix RHSA-2026:27734
-
Red Hat Enterprise Linux AppStream (v. 10) firefox 140.12.0-1.el10_2, thunderbird 140.12.0-1.el10_2fixed: vendor fix RHSA-2026:27733
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 140.12.0-1.el8_4, thunderbird 140.12.0-1.el8_4fixed: vendor fix RHSA-2026:36102
-
Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 140.12.0-1.el8_6, thunderbird 140.12.0-1.el8_6fixed: vendor fix RHSA-2026:37210
-
Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox 140.12.0-1.el8_8, thunderbird 140.12.0-1.el8_8fixed: vendor fix RHSA-2026:36103
show 8 moreshow fewer
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Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox 140.12.0-1.el9_2, firefox-x11 140.12.0-1.el9_2, thunderbird 140.12.0-1.el9_2fixed: vendor fix RHSA-2026:36101
-
Red Hat Enterprise Linux AppStream E4S (v.9.4) firefox 140.12.0-1.el9_4, firefox-x11 140.12.0-1.el9_4, thunderbird 140.12.0-1.el9_4fixed: vendor fix RHSA-2026:39011
-
Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox 140.12.0-1.el10_0, thunderbird 140.12.0-1.el10_0fixed: vendor fix RHSA-2026:36100
-
Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox 140.12.0-1.el9_6, firefox-x11 140.12.0-1.el9_6, thunderbird 140.12.0-1.el9_6fixed: vendor fix RHSA-2026:37391
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox 140.12.0-1.el8_4, thunderbird 140.12.0-1.el8_4fixed: vendor fix RHSA-2026:36102
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) firefox 140.12.0-1.el8_6, thunderbird 140.12.0-1.el8_6fixed: vendor fix RHSA-2026:37210
-
Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox 140.12.0-1.el8_8, thunderbird 140.12.0-1.el8_8fixed: vendor fix RHSA-2026:36103
-
Red Hat Enterprise Linux Server (v. 7 ELS) firefox 140.12.0-1.el7_9fixed: vendor fix RHSA-2026:38506
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
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| CISA ADP | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
- Mozilla Firefox
- Mozilla Thunderbird
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
- Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
- Red Hat Red Hat Enterprise Linux 6
- Red Hat Red Hat Enterprise Linux 7
Classification
References
-
access.redhat.com
/errata/RHSA-2026:38506
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:36100
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:38751
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:27733
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:30846
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:27717
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:33445
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:36102
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:39428
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:37210
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:39141
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:36103
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:39142
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:36101
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:39706
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:39011
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:38753
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:37391
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:38750
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:27734
vendor-advisory
-
access.redhat.com
/errata/RHSA-2026:29940
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-57/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-58/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-60/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-61/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=2041981
permissions-required
-
access.redhat.com
/security/cve/CVE-2026-12298
vdb-entry
-
bugzilla.redhat.com
/show_bug.cgi?id=2489248
issue-tracking
- security.access.redhat.com /data/csaf/v2/vex/2026/cve-2026-12298.json
Sources
- CVE List CVE-2026-12298
- NVD CVE-2026-12298
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.