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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2026-116135

HTTP::Body versions before 1.23_01 for Perl drop mixed-case percent escapes from urlencoded form fields instead of decoding them

No exploitation reported by the sources we read.

  • Published2026-10-28
  • WeaknessCWE-178

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

HTTP::Body versions before 1.23_01 for Perl drop mixed-case percent escapes from urlencoded form fields instead of decoding them. The decode table holds only the all-lowercase and all-uppercase spelling of each hex pair, while the escape pattern matches either case. An escape such as %aB finds no entry and is replaced with nothing, joining the bytes on either side. Hex digits in percent escapes are case-insensitive, and conforming decoders return the byte. A remote attacker can send a field name or value that a conforming decoder in front of the application reads differently, so that pass%aBword reaches the application as password.

Timeline

dates in UTC
  1. 2026-10-2817:15CVE 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

  • libhttp-body-perlUbuntu:26.10all versions · no fixed version listed
  • libhttp-body-perlUbuntu:26.04:LTSall versions · no fixed version listed
  • libhttp-body-perlUbuntu:24.04:LTSall versions · no fixed version listed
  • libhttp-body-perlUbuntu:22.04:LTSall versions · no fixed version listed
  • libhttp-body-perlUbuntu:20.04:LTSall versions · no fixed version listed
  • libhttp-body-perlUbuntu:18.04:LTSall versions · no fixed version listed
  • libhttp-body-perlUbuntu:16.04:LTSall versions · no fixed version listed
  • libhttp-body-perlDebian:14all versions · fixed in 1.24.01-1

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-116135 Red Hat Product Security

    perl-http-body: HTTP::Body: Security filter bypass via improper handling of mixed-case percent-encoding

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

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:H/I:H/A:H
Published
2026-10-28
Last Modified
2026-11-05
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-xw3w-872r-g8q5

Frequently asked questions

What is CVE-2026-116135?

HTTP::Body versions before 1.23_01 for Perl drop mixed-case percent escapes from urlencoded form fields instead of decoding them. The decode table holds only the all-lowercase and all-uppercase spelling of each hex pair, while the escape pattern matches either case. An escape such as %aB finds no entry and is replaced with nothing, joining the bytes on either side. Hex digits in percent escapes are case-insensitive, and conforming decoders return the byte. A remote attacker can send a field name or value that a conforming decoder in front of the application reads differently, so that pass%aBword reaches the application as password.

Is CVE-2026-116135 actively exploited?

Active exploitation of CVE-2026-116135 has not been confirmed. Its EPSS score was 0.3% on 2026-11-05, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-116135?

CVE-2026-116135 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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