RHSA-2026:0924: thunderbird security update

RHSA-2026:0924, released January 21, 2026, fixes 13 CVEs in thunderbird (version 0:140.7.0-1.el9_7). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0054

45th percentile

Priority of the 13 CVEs

Patch now 0
                                Urgent 0
                                High 13
                                Routine 0

Fixed package versions

Product	Release	Fixed in
thunderbird	RHEL 9	0:140.7.0-1.el9_7

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-0880	Sandbox escape due to integer overflow in the Graphics component	8.8	0.0054	None reported
High	CVE-2026-0879	Sandbox escape due to incorrect boundary conditions in the Graphics component	9.8	0.0050	None reported
High	CVE-2026-0891	Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147	8.1	0.0048	None reported
High	CVE-2026-0877	Mitigation bypass in the DOM: Security component	8.1	0.0047	None reported
High	CVE-2026-0878	Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component	8.0	0.0047	None reported
High	CVE-2026-0882	Use-after-free in the IPC component	8.8	0.0047	None reported
High	CVE-2026-0884	Use-after-free in the JavaScript Engine component	9.8	0.0046	None reported
High	CVE-2026-0885	Use-after-free in the JavaScript: GC component	7.5	0.0040	None reported
High	CVE-2026-0886	Incorrect boundary conditions in the Graphics component	7.5	0.0038	None reported
High	CVE-2025-14327	Spoofing issue in the Downloads Panel component	7.5	0.0038	None reported
High	CVE-2026-0883	Information disclosure in the Networking component	7.5	0.0036	None reported
High	CVE-2026-0887	Clickjacking issue, information disclosure in the PDF Viewer component	7.5	0.0033	None reported
High	CVE-2026-0890	Spoofing issue in the DOM: Copy & Paste and Drag & Drop component	7.5	0.0030	None reported

Also fixes CVE-2026-0880

Mozilla Firefox ESR (ach) 153.0.0
Mozilla Firefox ESR (ach)
Mozilla Firefox ESR (af) 153.0.0
Mozilla Firefox ESR (af)
Mozilla Firefox ESR (an) 153.0.0
Mozilla Firefox ESR (an)
Mozilla Firefox ESR (ar) 153.0.0
Mozilla Firefox ESR (ar)
Mozilla Firefox ESR (ast) 153.0.0
Mozilla Firefox ESR (ast)
Mozilla Firefox ESR (az) 153.0.0
Mozilla Firefox ESR (az)
Mozilla Firefox ESR (be) 153.0.0
Mozilla Firefox ESR (be)
Mozilla Firefox ESR (bg) 153.0.0
Mozilla Firefox ESR (bg)

Vendor advisory

https://access.redhat.com/errata/RHSA-2026:0924

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