# CVE-2026-109727: thunderbird: Use-after-free in the Audio/Video component CVE-2026-109727 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-109727, released October 16, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-109727 - Priority: High - CVSS: 8.2 (medium) - EPSS: 0.0023 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 13, 2026 ## Description Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | MozillaFirefox opensuse-leap 16.0 | 153.5.0-160000.1.1 | [OPENSUSE-SU-2026:22139-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22139-1.md) | Nov 7, 2026 | | Linux | MozillaFirefox sles 15.6 | 153.5.0-150400.157.16.1 | [SUSE-SU-2026:4834-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4834-1.md) | Nov 7, 2026 | | Linux | MozillaFirefox sles 15.7 | 153.5.0-150400.157.16.1 | [SUSE-SU-2026:4834-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4834-1.md) | Nov 7, 2026 | | Linux | MozillaFirefox sles 16.0 | 153.5.0-160000.1.1 | [SUSE-SU-2026:24260-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24260-1.md) | Nov 7, 2026 | | Linux | MozillaThunderbird sles 15.7 | 153.5.0-150400.13.9.1 | [SUSE-SU-2026:4736-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4736-1.md) | Nov 7, 2026 | | Linux | firefox RHEL 10 | 153.5.0-1.el10_2 | [RHSA-2026:89758](https://patchblox.com/security/data/fix/linux/rhsa-2026-89758.md) | Oct 31, 2026 | | Linux | firefox RHEL 8 | 0:153.5.0-1.el8_10 | [RHSA-2026:89756](https://patchblox.com/security/data/fix/linux/rhsa-2026-89756.md) | Oct 31, 2026 | | Linux | firefox RHEL 9 | 0:153.5.0-1.el9_8 | [RHSA-2026:89757](https://patchblox.com/security/data/fix/linux/rhsa-2026-89757.md) | Oct 31, 2026 | | Linux | firefox almalinux 10 | 153.5.0-1.el10_2 | [ALSA-2026:89758](https://patchblox.com/security/data/fix/linux/alsa-2026-89758.md) | Nov 7, 2026 | | Linux | firefox almalinux 8 | 153.5.0-1.el8_10 | [ALSA-2026:89756](https://patchblox.com/security/data/fix/linux/alsa-2026-89756.md) | Nov 7, 2026 | | Linux | firefox almalinux 9 | 153.5.0-1.el9_8 | [ALSA-2026:89757](https://patchblox.com/security/data/fix/linux/alsa-2026-89757.md) | Nov 7, 2026 | | Linux | firefox amzn 2023 | 153.5.0-1.amzn2023.0.1 | [ALAS2023-2026-3281](https://patchblox.com/security/data/fix/linux/alas2023-2026-3281.md) | Nov 7, 2026 | | Linux | firefox ol 10 | 0:153.5.0-1.0.1.el10_2 | [ELSA-2026-89758](https://patchblox.com/security/data/fix/linux/elsa-2026-89758.md) | Nov 7, 2026 | | Linux | firefox ol 8 | 0:153.5.0-1.0.1.el8_10 | [ELSA-2026-89756](https://patchblox.com/security/data/fix/linux/elsa-2026-89756.md) | Nov 7, 2026 | | Linux | firefox ol 9 | 0:153.5.0-1.0.1.el9_8 | [ELSA-2026-89757](https://patchblox.com/security/data/fix/linux/elsa-2026-89757.md) | Nov 7, 2026 | | Linux | firefox rocky 10 | 0:153.5.0-1.el10_2 | [RLSA-2026:89758](https://patchblox.com/security/data/fix/linux/rlsa-2026-89758.md) | Nov 7, 2026 | | Linux | firefox rocky 8 | 0:153.5.0-1.el8_10 | [RLSA-2026:89756](https://patchblox.com/security/data/fix/linux/rlsa-2026-89756.md) | Nov 7, 2026 | | Linux | firefox rocky 9 | 0:153.5.0-1.el9_8 | [RLSA-2026:89757](https://patchblox.com/security/data/fix/linux/rlsa-2026-89757.md) | Nov 7, 2026 | | Linux | firefox-debuginfo amzn 2023 | 153.5.0-1.amzn2023.0.1 | [ALAS2023-2026-3281](https://patchblox.com/security/data/fix/linux/alas2023-2026-3281.md) | Nov 7, 2026 | | Linux | firefox-debugsource amzn 2023 | 153.5.0-1.amzn2023.0.1 | [ALAS2023-2026-3281](https://patchblox.com/security/data/fix/linux/alas2023-2026-3281.md) | Nov 7, 2026 | | Linux | firefox-esr Debian 12.15 (bookworm) | 153.5.0esr-1~deb12u1 | [DEBIAN-CVE-2026-109727](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109727.md) | Oct 16, 2026 | | Linux | firefox-esr Debian 13.5 (trixie) | 153.5.0esr-1~deb13u1 | [DEBIAN-CVE-2026-109727](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109727.md) | Oct 16, 2026 | | Linux | firefox-esr Debian 14 | 153.5.0esr-1 | [DEBIAN-CVE-2026-109727](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109727.md) | Oct 16, 2026 | | Linux | firefox-x11 RHEL 9 | 0:153.5.0-1.el9_8 | [RHSA-2026:89757](https://patchblox.com/security/data/fix/linux/rhsa-2026-89757.md) | Oct 31, 2026 | | Linux | firefox-x11 almalinux 9 | 153.5.0-1.el9_8 | [ALSA-2026:89757](https://patchblox.com/security/data/fix/linux/alsa-2026-89757.md) | Nov 7, 2026 | | Linux | firefox-x11 ol 9 | 0:153.5.0-1.0.1.el9_8 | [ELSA-2026-89757](https://patchblox.com/security/data/fix/linux/elsa-2026-89757.md) | Nov 7, 2026 | | Linux | thunderbird Debian 12.15 (bookworm) | 1:153.5.1esr-1~deb12u1 | [DEBIAN-CVE-2026-109727](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109727.md) | Oct 16, 2026 | | Linux | thunderbird Debian 13.5 (trixie) | 1:153.5.1esr-1~deb13u1 | [DEBIAN-CVE-2026-109727](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109727.md) | Oct 16, 2026 | | Linux | thunderbird Debian 14 | 1:153.5.0esr-1 | [DEBIAN-CVE-2026-109727](https://patchblox.com/security/data/fix/linux/debian-cve-2026-109727.md) | Oct 16, 2026 | | Linux | thunderbird RHEL 9 | 0:153.5.0-1.el9_8 | [RHSA-2026:93443](https://patchblox.com/security/data/fix/linux/rhsa-2026-93443.md) | Nov 3, 2026 | | Linux | thunderbird almalinux 9 | 153.5.0-1.el9_8.alma.1 | [ALSA-2026:93443](https://patchblox.com/security/data/fix/linux/alsa-2026-93443.md) | Nov 7, 2026 | | Linux | thunderbird ol 9 | 0:153.5.0-1.0.1.el9_8 | [ELSA-2026-93443](https://patchblox.com/security/data/fix/linux/elsa-2026-93443.md) | Nov 7, 2026 | | Linux | thunderbird rocky 9 | 0:153.5.0-1.el9_8 | [RLSA-2026:93443](https://patchblox.com/security/data/fix/linux/rlsa-2026-93443.md) | Nov 7, 2026 | --- Data as of 2026-11-07T18:46:35Z UTC. 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