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VulnerabilityPublished

CVE-2026-116265: MIME-tools (Perl module) · Interpretation Conflict

Affects MIME-tools (Perl module)Source CVE Database V5

0

Not known to be exploited : upgrade to 5.521 soon.

Data as of 28 Oct 2026, 17:57 UTC

Severity
High

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

Patch
Available – fixed in 5.521

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 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 MIME-tools (Perl module) to 5.521.

Affected software

ProductAffectedFixed in
MIME-toolsAffected
  • <5.521
Fixed in
  • 5.521
CPANMIME-toolspkg:cpan/MIME-toolsOther threatsAffected
  • <5.521
Fixed in
  • 5.521

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

AI-suggested

A fix is available in MIME::Field::ParamVal version 5.521. Users should upgrade to version 5.521 or later to address this boundary ambiguity vulnerability.

Description

MIME::Field::ParamVal versions before 5.521 for Perl have a vulnerability where ambiguous multipart boundaries written as RFC 2231 continuations are not properly flagged. This allows a remote sender to craft a MIME message that splits on different boundaries between the MIME::Parser and other mail readers, potentially hiding attachments from filters relying on ambiguous_content() while still displaying them in the recipient's mail client.

References

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