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Red Hat · Security advisory · October 31, 2026
Red Hat · Security advisory · October 31, 2026RHSA-2026:89757: Security update for 2 packages
RHSA-2026:89757, released October 31, 2026, fixes 48 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
48
4 rated Critical
Exploited
0
None reported
Highest CVSS
9.6
Base score, 0 to 10
Highest EPSS
0.0048
41st percentile
Priority of the 48 CVEs
Patch now 0
Urgent 4
High 44
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| firefox | RHEL 9 | 0:153.5.0-1.el9_8 |
| firefox-x11 | RHEL 9 | 0:153.5.0-1.el9_8 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-109745 | firefox-esr: Sandbox escape due to uninitialized memory in the DOM: Web Serial component | 9.6 | 0.0035 | None reported |
| Urgent | CVE-2026-109708 | firefox-esr: Sandbox escape due to incorrect boundary conditions in the Networking component | 9.6 | 0.0033 | None reported |
| Urgent | CVE-2026-109705 | thunderbird: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component | 9.6 | 0.0033 | None reported |
| Urgent | CVE-2026-109707 | firefox-esr: Sandbox escape due to use-after-free in the Networking component | 9.6 | 0.0033 | None reported |
| High | CVE-2026-45186 | In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input. | 8.2 | 0.0048 | None reported |
| High | CVE-2026-109733 | thunderbird: JIT miscompilation in the JavaScript Engine: JIT component | 8.8 | 0.0046 | None reported |
| High | CVE-2026-109704 | firefox: Privilege escalation in the Application Update component | 8.2 | 0.0041 | None reported |
| High | CVE-2026-109730 | thunderbird: Integer overflow in the Graphics component | 8.8 | 0.0037 | None reported |
| High | CVE-2026-109743 | thunderbird: Privilege escalation in the Panning and Zooming component | 8.8 | 0.0035 | None reported |
| High | CVE-2026-109762 | firefox-esr: Incorrect boundary conditions in the SVG component | 8.8 | 0.0035 | None reported |
| High | CVE-2026-109740 | firefox: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Secu... | 8.2 | 0.0035 | None reported |
| High | CVE-2026-109753 | thunderbird: Incorrect boundary conditions in the Layout component | 8.1 | 0.0034 | None reported |
| High | CVE-2026-109737 | firefox-esr: Mitigation bypass in the Enterprise Policies component | 8.1 | 0.0034 | None reported |
| High | CVE-2026-109760 | firefox-esr: Mitigation bypass in the Networking: HTTP component | 8.1 | 0.0034 | None reported |
| High | CVE-2026-109709 | thunderbird: Information disclosure, privilege escalation in the Security: Process Sandboxing component | 8.8 | 0.0033 | None reported |
| High | CVE-2026-109736 | firefox-esr: Frame poisoning in the Layout component | 8.1 | 0.0032 | None reported |
| High | CVE-2026-109744 | firefox-esr: Other issue in the DOM: File component | 8.1 | 0.0032 | None reported |
| High | CVE-2026-109754 | firefox-esr: Incorrect boundary conditions in the DOM: Editor component | 8.1 | 0.0032 | None reported |
| High | CVE-2026-109756 | thunderbird: Privilege escalation in the DOM: Navigation component | 8.8 | 0.0032 | None reported |
| High | CVE-2026-109715 | firefox-esr: Incorrect boundary conditions in the JavaScript Engine component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-109716 | firefox-esr: Incorrect boundary conditions in the JavaScript Engine component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-109722 | firefox-esr: JIT miscompilation in the JavaScript Engine: JIT component | 8.8 | 0.0031 | None reported |
| High | CVE-2026-109721 | firefox-esr: Incorrect boundary conditions in the JavaScript Engine: JIT component | 8.8 | 0.0028 | None reported |
| High | CVE-2026-109782 | firefox-esr: Mitigation bypass in the File Handling component | 8.3 | 0.0027 | None reported |
| High | CVE-2026-109720 | firefox-esr: JIT miscompilation in the JavaScript: WebAssembly component | 8.8 | 0.0026 | None reported |
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