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CVE-2025-3875VulnerabilityPublished Updated

Red Hat Security Advisory: thunderbird security update

Affects Red HatSource GCVE Database

0

Mentioned vulnerabilities

Not known to be exploited.

Data as of 26 Oct 2026, 07:57 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 May 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 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
Red Hatredhat/thunderbirdpkg:rpm/redhat/thunderbirdOther threatsAffected
  • >=9.0
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 9.0 that address these vulnerabilities. Users and administrators should apply the provided security update promptly by following the instructions in the Red Hat advisory (https://access.redhat.com/articles/11258). No additional mitigation steps are indicated beyond applying the official update.

Description

Multiple security vulnerabilities affecting Mozilla Thunderbird in Red Hat Enterprise Linux 9.0 have been addressed in an important security update. These include JavaScript execution via spoofed PDF attachments and file:/// links, sender spoofing through malformed From headers, unsolicited file downloads leading to disk space exhaustion and credential leakage via mailbox:/// links, and tracking links in attachments bypassing remote content blocking. The update mitigates these issues to protect users from potential exploitation.

References

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