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CVE-2026-118175VulnerabilityPublished

When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a different

Source GCVE Database

0
Authoritative record:CVE-2026-118175· High

Not known to be exploited : upgrade to 159 soon.

Data as of 27 Oct 2026, 22:13 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch
Available – fixed in 159

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Oct 2026

  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 the Ubuntu ubuntu/thunderbird package to 159.

Affected software

ProductAffectedFixed in
Ubuntuubuntu/thunderbirdpkg:deb/ubuntu/thunderbirdOther threatsAffected
  • <159
Fixed in
  • 159

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability has been fixed in Thunderbird versions 159 and 153.6. Users and administrators should upgrade to these versions or later to remediate the issue. No additional mitigation steps are required once the update is applied.

Description

A vulnerability in Thunderbird allowed parts of a different email message stored in the same folder to be embedded into a reply, forwarded, or edited message without showing a blocked content warning. If the user sent the message, the content of the other message was disclosed to the recipients. This issue was fixed in Thunderbird versions 159 and 153.6.

References

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