CVE-2026-109751
thunderbird: Information disclosure in the Networking component
CVE-2026-109751 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-109751, released October 16, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0026
17th percentile
Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| MozillaFirefox · opensuse-leap 16.0 | 153.5.0-160000.1.1 | OPENSUSE-SU-2026:22139-1 | Nov 7, 2026 |
| MozillaFirefox · sles 15.6 | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 | Nov 7, 2026 |
| MozillaFirefox · sles 15.7 | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 | Nov 7, 2026 |
| MozillaFirefox · sles 16.0 | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 | Nov 7, 2026 |
| MozillaThunderbird · sles 15.7 | 153.5.0-150400.13.9.1 | SUSE-SU-2026:4736-1 | Nov 7, 2026 |
| firefox · RHEL 8 | 0:153.5.0-1.el8_10 | RHSA-2026:89756 | Oct 31, 2026 |
| firefox · RHEL 9 | 0:153.5.0-1.el9_8 | RHSA-2026:89757 | Oct 31, 2026 |
| firefox · almalinux 8 | 153.5.0-1.el8_10 | ALSA-2026:89756 | Nov 7, 2026 |
| firefox · almalinux 9 | 153.5.0-1.el9_8 | ALSA-2026:89757 | Nov 7, 2026 |
| firefox · amzn 2023 | 153.5.0-1.amzn2023.0.1 | ALAS2023-2026-3281 | Nov 7, 2026 |
| firefox · ol 8 | 0:153.5.0-1.0.1.el8_10 | ELSA-2026-89756 | Nov 7, 2026 |
| firefox · ol 9 | 0:153.5.0-1.0.1.el9_8 | ELSA-2026-89757 | Nov 7, 2026 |
| firefox · rocky 8 | 0:153.5.0-1.el8_10 | RLSA-2026:89756 | Nov 7, 2026 |
| firefox · rocky 9 | 0:153.5.0-1.el9_8 | RLSA-2026:89757 | Nov 7, 2026 |
| firefox-debuginfo · amzn 2023 | 153.5.0-1.amzn2023.0.1 | ALAS2023-2026-3281 | Nov 7, 2026 |
| firefox-debugsource · amzn 2023 | 153.5.0-1.amzn2023.0.1 | ALAS2023-2026-3281 | Nov 7, 2026 |
| firefox-esr · Debian 12.15 (bookworm) | 153.5.0esr-1~deb12u1 | DEBIAN-CVE-2026-109751 | Oct 16, 2026 |
| firefox-esr · Debian 13.5 (trixie) | 153.5.0esr-1~deb13u1 | DEBIAN-CVE-2026-109751 | Oct 16, 2026 |
| firefox-esr · Debian 14 | 153.5.0esr-1 | DEBIAN-CVE-2026-109751 | Oct 16, 2026 |
| firefox-x11 · RHEL 9 | 0:153.5.0-1.el9_8 | RHSA-2026:89757 | Oct 31, 2026 |
| firefox-x11 · almalinux 9 | 153.5.0-1.el9_8 | ALSA-2026:89757 | Nov 7, 2026 |
| firefox-x11 · ol 9 | 0:153.5.0-1.0.1.el9_8 | ELSA-2026-89757 | Nov 7, 2026 |
| thunderbird · Debian 12.15 (bookworm) | 1:153.5.1esr-1~deb12u1 | DEBIAN-CVE-2026-109751 | Oct 16, 2026 |
| thunderbird · Debian 13.5 (trixie) | 1:153.5.1esr-1~deb13u1 | DEBIAN-CVE-2026-109751 | Oct 16, 2026 |
| thunderbird · Debian 14 | 1:153.5.0esr-1 | DEBIAN-CVE-2026-109751 | Oct 16, 2026 |
| thunderbird · RHEL 9 | 0:153.5.0-1.el9_8 | RHSA-2026:93443 | Nov 3, 2026 |
| thunderbird · almalinux 9 | 153.5.0-1.el9_8.alma.1 | ALSA-2026:93443 | Nov 7, 2026 |
| thunderbird · ol 9 | 0:153.5.0-1.0.1.el9_8 | ELSA-2026-93443 | Nov 7, 2026 |
| thunderbird · rocky 9 | 0:153.5.0-1.el9_8 | RLSA-2026:93443 | Nov 7, 2026 |
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