OESA-2026-3896

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-3896
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-3896.json
JSON Data
https://api.osv.dev/v1/vulns/OESA-2026-3896
Upstream
CVE (10)
  • CVE-2026-16365
  • CVE-2026-75874
  • CVE-2026-84119
  • CVE-2026-84120
  • CVE-2026-84121
  • CVE-2026-84122
  • CVE-2026-84124
  • CVE-2026-84131
  • CVE-2026-84143
  • CVE-2026-84145
Published
2026-09-20T13:23:00Z
Modified
2026-09-20T13:30:23Z
Severity
  • 10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
firefox security update
Details

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo

Security Fix(es):

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153.(CVE-2026-16365)

Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154 and Thunderbird 154.(CVE-2026-75874)

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, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 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. 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-2026-84131)

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 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 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)

Database specific 
{
    "severity":  "Critical"
}
References

Affected packages

openEuler:24.03-LTS-SP3 / firefox

Package

Name
firefox
Purl
pkg:rpm/openEuler/firefox&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
140.16.0-1.oe2403sp3

Ecosystem specific 

{
    "aarch64":  [
        "firefox-140.16.0-1.oe2403sp3.aarch64.rpm",
        "firefox-debuginfo-140.16.0-1.oe2403sp3.aarch64.rpm",
        "firefox-debugsource-140.16.0-1.oe2403sp3.aarch64.rpm"
    ],
    "src":  [
        "firefox-140.16.0-1.oe2403sp3.src.rpm"
    ],
    "x86_64":  [
        "firefox-140.16.0-1.oe2403sp3.x86_64.rpm",
        "firefox-debuginfo-140.16.0-1.oe2403sp3.x86_64.rpm",
        "firefox-debugsource-140.16.0-1.oe2403sp3.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-3896.json"