An update for thunderbird is now available for openEuler-24.03-LTS-SP3 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-3982 Final 1.0 1.0 2026-09-20 Initial 2026-09-20 2026-09-20 openEuler SA Tool V1.0 2026-09-20 thunderbird security update An update for thunderbird is now available for openEuler-24.03-LTS-SP3 Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84119) Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.(CVE-2026-84120) Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84121) Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84122) Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84124) Privilege escalation due to invalid pointer in the Graphics component of Mozilla Firefox. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.(CVE-2026-84131) Internally found bugs present in Firefox 154, Firefox ESR 153.1 and Firefox ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2.(CVE-2026-84143) Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84145) Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84639) A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84640) A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.(CVE-2026-84641) An update for thunderbird is now available for openEuler-24.03-LTS-SP3. openEuler Security has rated this update as having a security impact of critical. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. Critical thunderbird https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84119 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84120 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84121 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84122 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84124 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84131 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84143 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84145 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84639 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84640 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-84641 https://nvd.nist.gov/vuln/detail/CVE-2026-84119 https://nvd.nist.gov/vuln/detail/CVE-2026-84120 https://nvd.nist.gov/vuln/detail/CVE-2026-84121 https://nvd.nist.gov/vuln/detail/CVE-2026-84122 https://nvd.nist.gov/vuln/detail/CVE-2026-84124 https://nvd.nist.gov/vuln/detail/CVE-2026-84131 https://nvd.nist.gov/vuln/detail/CVE-2026-84143 https://nvd.nist.gov/vuln/detail/CVE-2026-84145 https://nvd.nist.gov/vuln/detail/CVE-2026-84639 https://nvd.nist.gov/vuln/detail/CVE-2026-84640 https://nvd.nist.gov/vuln/detail/CVE-2026-84641 openEuler-24.03-LTS-SP3 thunderbird-140.15.0-1.oe2403sp3.x86_64.rpm thunderbird-debuginfo-140.15.0-1.oe2403sp3.x86_64.rpm thunderbird-debugsource-140.15.0-1.oe2403sp3.x86_64.rpm thunderbird-librnp-rnp-140.15.0-1.oe2403sp3.x86_64.rpm thunderbird-wayland-140.15.0-1.oe2403sp3.x86_64.rpm thunderbird-140.15.0-1.oe2403sp3.aarch64.rpm thunderbird-debuginfo-140.15.0-1.oe2403sp3.aarch64.rpm thunderbird-debugsource-140.15.0-1.oe2403sp3.aarch64.rpm thunderbird-librnp-rnp-140.15.0-1.oe2403sp3.aarch64.rpm thunderbird-wayland-140.15.0-1.oe2403sp3.aarch64.rpm thunderbird-140.15.0-1.oe2403sp3.src.rpm Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84119 openEuler-24.03-LTS-SP3 Critical 9.6 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2. 2026-09-20 CVE-2026-84120 openEuler-24.03-LTS-SP3 Medium 5.4 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84121 openEuler-24.03-LTS-SP3 Critical 9.6 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84122 openEuler-24.03-LTS-SP3 Medium 5.4 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84124 openEuler-24.03-LTS-SP3 Medium 5.4 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Privilege escalation due to invalid pointer in the Graphics component of Mozilla Firefox. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2. 2026-09-20 CVE-2026-84131 openEuler-24.03-LTS-SP3 High 8.8 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Internally found bugs present in Firefox 154, Firefox ESR 153.1 and Firefox ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, and Firefox ESR 153.2. 2026-09-20 CVE-2026-84143 openEuler-24.03-LTS-SP3 Critical 9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84145 openEuler-24.03-LTS-SP3 High 7.5 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84639 openEuler-24.03-LTS-SP3 Critical 9.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84640 openEuler-24.03-LTS-SP3 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982 A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. 2026-09-20 CVE-2026-84641 openEuler-24.03-LTS-SP3 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N thunderbird security update 2026-09-20 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3982