RHSA-2026:20586: thunderbird security update

RHSA-2026:20586, released May 27, 2026, fixes 5 CVEs in thunderbird (version 0:140.10.1-1.el8_10). 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

0.0047

40th percentile

Priority of the 5 CVEs

Patch now 0
                                Urgent 0
                                High 5
                                Routine 0

Fixed package versions

Product	Release	Fixed in
thunderbird	RHEL 8	0:140.10.1-1.el8_10

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-8091	Incorrect boundary conditions in the Audio/Video: Playback component	9.8	0.0047	None reported
High	CVE-2026-7323	Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1	8.8	0.0038	None reported
High	CVE-2026-7320	Information disclosure due to incorrect boundary conditions in the Audio/Video component	8.8	0.0032	None reported
High	CVE-2026-7322	Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1	8.8	0.0032	None reported
High	CVE-2026-7321	Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component	9.6	0.0026	None reported

Also fixes CVE-2026-8091

Mozilla Thunderbird (af) 141.0
Mozilla Thunderbird (af)
Mozilla Thunderbird (ar) 141.0
Mozilla Thunderbird (ar)
Mozilla Thunderbird (ast) 141.0
Mozilla Thunderbird (ast)
Mozilla Thunderbird (be) 141.0
Mozilla Thunderbird (be)
Mozilla Thunderbird (bg) 141.0
Mozilla Thunderbird (bg)
Mozilla Thunderbird (br) 141.0
Mozilla Thunderbird (br)
Mozilla Thunderbird (ca) 141.0
Mozilla Thunderbird (ca)
Mozilla Thunderbird (cak) 141.0
Mozilla Thunderbird (cak)

Vendor advisory

https://access.redhat.com/errata/RHSA-2026:20586

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