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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2026-116268

MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters

No exploitation reported by the sources we read.

  • Published2026-10-28
  • WeaknessCWE-1333

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters. The comment pattern used to parse Content-Type and Content-Disposition parameters scans from each "(" to the next ")". In a field with no ")", every "(" scans to the end of the header and fails, so parsing takes time quadratic in the header length. The field is parsed again on each attribute lookup, several times per MIME entity. A 40 KB header takes about 7 seconds to parse once.

Timeline

dates in UTC
  1. 2026-10-2817:33CVE publishedCNA

Versions per branch

Products declared by the CNA1 product

As CPANSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-28

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libmime-tools-perlUbuntu:26.10all versions · no fixed version listed
  • libmime-tools-perlUbuntu:26.04:LTSall versions · no fixed version listed
  • libmime-tools-perlUbuntu:24.04:LTSall versions · no fixed version listed
  • libmime-tools-perlUbuntu:22.04:LTSall versions · no fixed version listed
  • libmime-tools-perlUbuntu:20.04:LTSall versions · no fixed version listed
  • libmime-tools-perlUbuntu:18.04:LTSall versions · no fixed version listed
  • libmime-tools-perlUbuntu:16.04:LTSall versions · no fixed version listed
  • libmime-tools-perlUbuntu:14.04:LTSall versions · no fixed version listed

5 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-116268 Red Hat Product Security1 known affected

    perl-MIME-tools: perl-MIME-tools: Denial of Service via unclosed comments in header parameters

    perl-MIME-tools.src as a component of Red Hat Enterprise Linux 6

Full record on NVD

Fix

  1. No fix planned, says the vendor Red Hat Product Security CVE-2026-116268 · 1 productOut of support scope

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-10-28
Last Modified
2026-11-05
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-cgxv-575f-wxjm

Frequently asked questions

What is CVE-2026-116268?

MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters. The comment pattern used to parse Content-Type and Content-Disposition parameters scans from each "(" to the next ")". In a field with no ")", every "(" scans to the end of the header and fails, so parsing takes time quadratic in the header length. The field is parsed again on each attribute lookup, several times per MIME entity. A 40 KB header takes about 7 seconds to parse once.

Is CVE-2026-116268 actively exploited?

Active exploitation of CVE-2026-116268 has not been confirmed. Its EPSS score was 0.2% on 2026-11-05, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-116268?

CVE-2026-116268 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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