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

Type: advisorySources: Official CVE List

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-116135
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 19:25 UTC · Revision 1

Source evidence

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

core-cve · Original source

Published 28 Oct 2026, 17:15 UTC

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.

cve:CVE-2026-116135
Complete source record
{
  "id": "64839ffa01e340ee7d1fdbdfa4d28a064195fae0a66ad1704b279bf60e7e1080",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116135",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HTTP::Body versions before 1.23_01 for Perl drop mixed-case percent escapes from urlencoded form fields instead of decoding them",
    "summary": "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.",
    "evidence": "cve:CVE-2026-116135",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-116135",
      "aliases": [
        "CVE-2026-116135"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://github.com/libwww-perl/HTTP-Body",
          "modules": [
            "HTTP::Body"
          ],
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.23_01",
              "versionType": "custom"
            }
          ],
          "packageURL": "pkg:cpan/HTTP-Body",
          "packageName": "HTTP-Body",
          "programFiles": [
            "lib/HTTP/Body/UrlEncoded.pm"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "HTTP::Body::UrlEncoded::spin"
            }
          ]
        }
      ],
      "modified": "2026-10-28T17:15:50.270Z",
      "provider": "cve",
      "references": [
        "https://github.com/libwww-perl/HTTP-Body/commit/336f1a23b4115a5cbeb546f36df5af62c90bdc0d.patch",
        "https://metacpan.org/release/GETTY/HTTP-Body-1.24/changes",
        "https://www.rfc-editor.org/rfc/rfc3986#section-2.1"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
          "shortName": "CPANSec",
          "dateUpdated": "2026-10-28T17:15:50.270Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116135",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 464409,
  "published_at": "2026-10-28T17:15:50.27+00:00"
}