Linux · Security advisory · January 13, 2026

RHSA-2026:2286: thunderbird security update

RHSA-2026:2286, released January 13, 2026, fixes 13 CVEs in thunderbird (version 140.7.0-1.el10_0). None of them is reported as exploited. Patch Radar priority: High.

High
CVEs closed
13
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0054
45th percentile

Priority of the 13 CVEs

Patch now 0 Urgent 0 High 13 Routine 0

Fixed package versions

ProductReleaseFixed in
thunderbirdRHEL 10140.7.0-1.el10_0

CVEs this fix closes

PriorityCVETitleImpactCVSSEPSSExploitation
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
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