# CVE-2023-29539: Mozilla Firefox and 4 others: When handling the filename directive in the Content-Disposition header, the filename would be truncated… CVE-2023-29539 is fixed in 14 products on 2 platforms, first by firefox 112.0+build2-0ubuntu0.18.04.1, released April 11, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-29539 - Priority: High - CVSS: 8.8 (high) - EPSS: 0.0074 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 11, 2023 - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-29539 ## Description When handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character. This could have led to reflected file download attacks potentially tricking users to install malware. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox (en-US) | 112.0 | [Mozilla Firefox (en-US) 112.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-112.0.md) | Apr 12, 2023 | | Windows apps | Mozilla Firefox ESR (en-US) | 115.4.0 | [Mozilla Firefox ESR (en-US) 115.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-115.4.0.md) | Oct 17, 2023 | | Windows apps | Mozilla Thunderbird (en-US) | 115.8.0 | [Mozilla Thunderbird (en-US) 115.8.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-115.8.0.md) | Feb 21, 2024 | | Linux | firefox RHEL 8 | 0:102.10.0-1.el8_7 | [RHSA-2023:1787](https://patchblox.com/security/data/fix/linux/rhsa-2023-1787.md) | Apr 14, 2023 | | Linux | firefox RHEL 9 | 0:102.10.0-1.el9_1 | [RHSA-2023:1786](https://patchblox.com/security/data/fix/linux/rhsa-2023-1786.md) | Apr 14, 2023 | | Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 112.0+build2-0ubuntu0.18.04.1 | [firefox 112.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-112.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | firefox Ubuntu 20.04 LTS (focal) | 112.0+build2-0ubuntu0.20.04.1 | [firefox 112.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-112.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | firefox almalinux 8 | 102.10.0-1.el8_7.alma | [ALSA-2023:1787](https://patchblox.com/security/data/fix/linux/alsa-2023-1787.md) | Apr 14, 2023 | | Linux | firefox almalinux 9 | 102.10.0-1.el9_1.alma | [ALSA-2023:1786](https://patchblox.com/security/data/fix/linux/alsa-2023-1786.md) | Apr 14, 2023 | | Linux | firefox ol 8 | 0:102.10.0-1.0.1.el8_7 | [ELSA-2023-1787](https://patchblox.com/security/data/fix/linux/elsa-2023-1787.md) | Apr 14, 2023 | | Linux | firefox ol 9 | 0:102.10.0-1.0.1.el9_1 | [ELSA-2023-1786](https://patchblox.com/security/data/fix/linux/elsa-2023-1786.md) | Apr 14, 2023 | | Linux | firefox-esr Debian 12.15 (bookworm) | 102.10.0esr-1 | [DEBIAN-CVE-2023-29539](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29539.md) | Jun 2, 2023 | | Linux | firefox-esr Debian 13.5 (trixie) | 102.10.0esr-1 | [DEBIAN-CVE-2023-29539](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29539.md) | Jun 2, 2023 | | Linux | firefox-esr Debian 14 | 102.10.0esr-1 | [DEBIAN-CVE-2023-29539](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29539.md) | Jun 2, 2023 | | Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 112.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 112.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-112.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 112.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 112.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-112.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 112.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 112.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-112.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 112.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 112.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-112.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | firefox-x11 RHEL 9 | 0:102.10.0-1.el9_1 | [RHSA-2023:1786](https://patchblox.com/security/data/fix/linux/rhsa-2023-1786.md) | Apr 14, 2023 | | Linux | firefox-x11 almalinux 9 | 102.10.0-1.el9_1.alma | [ALSA-2023:1786](https://patchblox.com/security/data/fix/linux/alsa-2023-1786.md) | Apr 14, 2023 | | Linux | firefox-x11 ol 9 | 0:102.10.0-1.0.1.el9_1 | [ELSA-2023-1786](https://patchblox.com/security/data/fix/linux/elsa-2023-1786.md) | Apr 14, 2023 | | Linux | thunderbird Debian 12.15 (bookworm) | 1:102.10.0-1 | [DEBIAN-CVE-2023-29539](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29539.md) | Jun 2, 2023 | | Linux | thunderbird Debian 13.5 (trixie) | 1:102.10.0-1 | [DEBIAN-CVE-2023-29539](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29539.md) | Jun 2, 2023 | | Linux | thunderbird Debian 14 | 1:102.10.0-1 | [DEBIAN-CVE-2023-29539](https://patchblox.com/security/data/fix/linux/debian-cve-2023-29539.md) | Jun 2, 2023 | | Linux | thunderbird RHEL 8 | 0:102.10.0-2.el8_7 | [RHSA-2023:1802](https://patchblox.com/security/data/fix/linux/rhsa-2023-1802.md) | Apr 17, 2023 | | Linux | thunderbird RHEL 9 | 0:102.10.0-2.el9_1 | [RHSA-2023:1809](https://patchblox.com/security/data/fix/linux/rhsa-2023-1809.md) | Apr 17, 2023 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:102.10.0+build2-0ubuntu0.18.04.1 | [thunderbird 1:102.10.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-102.10.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:102.10.0+build2-0ubuntu0.20.04.1 | [thunderbird 1:102.10.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-102.10.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:102.10.0+build2-0ubuntu0.22.04.1 | [thunderbird 1:102.10.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-102.10.0-build2-0ubuntu0.22.04.1.md) | Apr 11, 2023 | | Linux | thunderbird almalinux 8 | 102.10.0-2.el8_7.alma | [ALSA-2023:1802](https://patchblox.com/security/data/fix/linux/alsa-2023-1802.md) | Apr 17, 2023 | | Linux | thunderbird almalinux 9 | 102.10.0-2.el9_1.alma | [ALSA-2023:1809](https://patchblox.com/security/data/fix/linux/alsa-2023-1809.md) | Apr 17, 2023 | | Linux | thunderbird ol 8 | 0:102.10.0-2.0.1.el8_7 | [ELSA-2023-1802](https://patchblox.com/security/data/fix/linux/elsa-2023-1802.md) | Apr 18, 2023 | | Linux | thunderbird ol 9 | 0:102.10.0-2.0.1.el9_1 | [ELSA-2023-1809](https://patchblox.com/security/data/fix/linux/elsa-2023-1809.md) | Apr 18, 2023 | | Linux | thunderbird rocky 8 | 0:102.10.0-2.el8_7 | [RLSA-2023:1802](https://patchblox.com/security/data/fix/linux/rlsa-2023-1802.md) | Apr 26, 2023 | | Linux | thunderbird rocky 9 | 0:102.10.0-2.el9_1 | [RLSA-2023:1809](https://patchblox.com/security/data/fix/linux/rlsa-2023-1809.md) | Apr 26, 2023 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:102.10.0+build2-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:102.10.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-102.10.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:102.10.0+build2-0ubuntu0.20.04.1 | [thunderbird-gnome-support 1:102.10.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-102.10.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:102.10.0+build2-0ubuntu0.22.04.1 | [thunderbird-gnome-support 1:102.10.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-102.10.0-build2-0ubuntu0.22.04.1.md) | Apr 11, 2023 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:102.10.0+build2-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:102.10.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-102.10.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:102.10.0+build2-0ubuntu0.20.04.1 | [thunderbird-mozsymbols 1:102.10.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-102.10.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:102.10.0+build2-0ubuntu0.22.04.1 | [thunderbird-mozsymbols 1:102.10.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-102.10.0-build2-0ubuntu0.22.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:102.10.0+build2-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:102.10.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-102.10.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:102.10.0+build2-0ubuntu0.20.04.1 | [xul-ext-calendar-timezones 1:102.10.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-102.10.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:102.10.0+build2-0ubuntu0.22.04.1 | [xul-ext-calendar-timezones 1:102.10.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-102.10.0-build2-0ubuntu0.22.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:102.10.0+build2-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:102.10.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-102.10.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:102.10.0+build2-0ubuntu0.20.04.1 | [xul-ext-gdata-provider 1:102.10.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-102.10.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:102.10.0+build2-0ubuntu0.22.04.1 | [xul-ext-gdata-provider 1:102.10.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-102.10.0-build2-0ubuntu0.22.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:102.10.0+build2-0ubuntu0.18.04.1 | [xul-ext-lightning 1:102.10.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-102.10.0-build2-0ubuntu0.18.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:102.10.0+build2-0ubuntu0.20.04.1 | [xul-ext-lightning 1:102.10.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-102.10.0-build2-0ubuntu0.20.04.1.md) | Apr 11, 2023 | | Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:102.10.0+build2-0ubuntu0.22.04.1 | [xul-ext-lightning 1:102.10.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-102.10.0-build2-0ubuntu0.22.04.1.md) | Apr 11, 2023 | --- Data as of 2026-11-08T19:12:23Z UTC. 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