Red Hat Security Advisory: thunderbird security update
Affects Red Hat thunderbirdSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 7.5 High : upgrade Red Hat thunderbird to 140.7 soon.
Data as of 26 Oct 2026, 09:15 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 140.7
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 9 Dec 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
Upgrade Red Hat thunderbird to 140.7.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Product Security Red Hat | Affected
| Fixed in
|
AI-suggested
Security updates fixing these vulnerabilities are available and should be applied promptly. Red Hat has released updated packages for affected versions, including Thunderbird ESR 140.7 and Firefox ESR 140.7. Users should follow the vendor's update instructions as detailed in the Red Hat advisory (RHSA-2026:1462). No additional mitigation steps are indicated beyond applying the official patches.
Description
Multiple high severity security vulnerabilities affecting Mozilla Thunderbird ESR 140.x series have been addressed in recent updates. These include use-after-free, sandbox escape, integer overflow, mitigation bypass, privilege escalation, information disclosure, and spoofing issues across various components such as JavaScript engine, graphics, networking, DOM, audio/video, and IPC. The vendor advisory from Red Hat confirms the availability of security updates for affected versions.
References
- access.redhat.com/errata/RHSA-2026:1462 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2420507 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428961 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428963 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428965 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428966 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428967 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428968 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428969 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428971 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428972 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428973 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428975 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428978 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_1462.json (opens in a new tab)
- suse.com/support/security/rating/ (opens in a new tab)
- ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_20391-1.json (opens in a new tab)
- bugzilla.suse.com/1253718 (opens in a new tab)
- bugzilla.suse.com/1256340 (opens in a new tab)
- bugzilla.suse.com/1257397 (opens in a new tab)
- bugzilla.suse.com/1258231 (opens in a new tab)
- bugzilla.suse.com/1258568 (opens in a new tab)
- suse.com/security/cve/CVE-2025-14327/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0818/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0877/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0878/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0879/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0880/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0882/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0883/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0884/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0885/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0886/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0887/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0890/ (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=1970743 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-92/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-95/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-03/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-05/ (opens in a new tab)