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CVE-2025-14327VulnerabilityPublished Updated

Red Hat Security Advisory: thunderbird security update

Affects Red Hat thunderbirdSource GCVE Database

0

Mentioned vulnerabilities

Authoritative record:CVE-2025-14327· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat thunderbird to 147.1 or 140.7 soon.

Data as of 26 Oct 2026, 09:15 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
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 147.1, 140.7
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 147.1 or 140.7.

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • >=140.0 <140.7
  • >=147.0 <147.1
  • Red Hat
  • Red Hat Enterprise Linux
  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • src
  • thunderbird-0:140.7.0-2.el9_6.src
Fixed in
  • 140.7
  • 147.1

AI-suggested

An official security update is available and should be applied to affected systems. The update is included in Red Hat Enterprise Linux 9.6 Extended Update Support as Thunderbird ESR 140.7 and Thunderbird 147 packages. Users should follow Red Hat's guidance to apply these updates promptly. No additional mitigations are specified or required beyond applying the official patches.

Description

Multiple security vulnerabilities affecting Mozilla Thunderbird and Firefox components have been addressed in Red Hat Enterprise Linux 9.6 Extended Update Support. These include spoofing, use-after-free, memory safety bugs, sandbox escapes, information disclosure, mitigation bypass, and clickjacking issues across various components such as Downloads Panel, JavaScript engine, Graphics, IPC, Networking, DOM, and PDF Viewer. The update fixes these issues in Thunderbird ESR 140.7 and Thunderbird 147 versions.

References

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