CVE-2026-116135

Full vulnerability record from the local CVENow database.

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Awaiting Analysis

Source identifier

9b29abf9-4ab0-4765-b253-1875cd9b441e

Published

2026-10-28 18:17:12.683000

Last modified

2026-10-29 15:11:53

View original CVE JSON

{
  "id": "CVE-2026-116135",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-10-28T18:17:12.683",
  "lastModified": "2026-10-29T15:11:53.000",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "HTTP::Body versions before 1.23_01 for Perl drop mixed-case percent escapes from urlencoded form fields instead of decoding them.\n\nThe 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.\n\nA 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."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "HTTP-Body",
          "modules": [
            "HTTP::Body"
          ],
          "programFiles": [
            "lib/HTTP/Body/UrlEncoded.pm"
          ],
          "programRoutines": [
            {
              "name": "HTTP::Body::UrlEncoded::spin"
            }
          ],
          "repo": "https://github.com/libwww-perl/HTTP-Body",
          "packageURL": "pkg:cpan/HTTP-Body",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.23_01",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-178"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/libwww-perl/HTTP-Body/commit/336f1a23b4115a5cbeb546f36df5af62c90bdc0d.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://metacpan.org/release/GETTY/HTTP-Body-1.24/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://www.rfc-editor.org/rfc/rfc3986#section-2.1",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ]
}