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Fencer Vulns
high 7.5

CVE-2026-116273 json

MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion

published 2026-10-28 11 d ago modified 2026-11-05 3 d ago also EUVD-2026-112306

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion.

The max_parts option defaulted to -1, which disables the limit, so a parser created with default settings builds an entity for every part however many a message has.

Version 5.521 sets max_parts to 1000 and max_depth to 64 by default. Setting either to -1 still removes the limit.

Patch / fix

  • libmime-tools-perl Debian 14 5.522-1

debian advisories DEBIAN-CVE-2026-116273

  • perl-MIME-tools openSUSE Leap 16.0 5.522.0-bp160.1.1
  • perl-MIME-tools openSUSE Tumbleweed 5.522.0-1.1

opensuse advisories openSUSE-SU-2026:22226-1openSUSE-SU-2026:12347-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-116273 updated cvss 7.5

perl-mime-tools: perl-mime-tools: Denial of Service via memory exhaustion from excessive message parts

  • Red Hat Enterprise Linux 6 perl-MIME-tools 5.427-4.el6
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 d ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-1188 Initialization of a Resource with an Insecure Default
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.