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CVE-2026-116264VulnerabilityPublished Updated

Libmime tools perl: MIME::Field::ParamVal versions before 5.521 for Perl allow one invalid Content-Type parameter to

Affects libmime-tools-perlSource GCVE Database

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Authoritative record:CVE-2026-116264· High

Not known to be exploited.

Data as of 5 Nov 2026, 12:35 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 5 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10libmime-tools-perlpkg:deb/ubuntu/libmime-tools-perl?arch=source&distro=stonkingOther threatsAffected
  • =5.517-1
Fixed in–
Ubuntu 26.04 LTSlibmime-tools-perlpkg:deb/ubuntu/libmime-tools-perl?arch=source&distro=resoluteOther threatsAffected
  • =5.515-1
  • =5.517-1
Fixed in–
Ubuntu 24.04 LTSlibmime-tools-perlpkg:deb/ubuntu/libmime-tools-perl?arch=source&distro=nobleOther threatsAffected
  • 5.510-3 – 5.514-1
4 affected builds
Fixed in–
Ubuntu 22.04 LTSlibmime-tools-perlpkg:deb/ubuntu/libmime-tools-perl?arch=source&distro=jammyOther threatsAffected
  • =5.509-1
Fixed in–
Ubuntu 20.04 LTSlibmime-tools-perlpkg:deb/ubuntu/libmime-tools-perl?arch=source&distro=focalOther threatsAffected
  • =5.509-1
Fixed in–
Ubuntu 18.04 LTSlibmime-tools-perlpkg:deb/ubuntu/libmime-tools-perl?arch=source&distro=bionicOther threatsAffected
  • =5.508-1
  • =5.509-1
Fixed in–

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

Description

MIME::Field::ParamVal versions before 5.521 for Perl allow one invalid Content-Type parameter to hide the parameters after it, including the multipart boundary. Parameter parsing stops at the first parameter whose name it cannot read, such as x:y=1 or a name containing an 8-bit byte, and drops every parameter after it. When the boundary is among them, MIME::Parser keeps the multipart body as a single undecoded part without marking the parse as ambiguous. Mail readers that skip the invalid parameter still find the boundary. A remote sender can hide an attachment from a filter that relies on ambiguous_content() while the recipient's mail client shows it.

References

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