Red Hat Security Advisory: thunderbird security update
Affects Red Hat thunderbirdSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 6.5 Medium.
Data as of 26 Oct 2026, 09:15 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 11 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Red Hatredhat/thunderbirdpkg:rpm/redhat/thunderbirdOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Red Hat has released updated Thunderbird packages for Red Hat Enterprise Linux 8.8 variants that address these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) to remediate the issues. Since this is an official fix, applying the update is the recommended mitigation. No additional vendor guidance indicates other mitigations or that no action is required.
Description
Mozilla Thunderbird, a standalone mail and newsgroup client, has multiple security vulnerabilities including unsolicited file download, disk space exhaustion, and credential leakage via mailbox:/// links (CVE-2025-5986). Red Hat has issued an important security advisory providing updates for affected Red Hat Enterprise Linux 8.8 variants. The advisory addresses these issues with updated Thunderbird packages. No CVSS score is provided, but the severity is rated as important by Red Hat.