Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-40562",
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "dateUpdated": "2026-05-07T16:13:49.501Z",
    "dateReserved": "2026-04-14T11:35:53.644Z",
    "datePublished": "2026-05-06T12:36:34.715Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec",
        "dateUpdated": "2026-05-07T16:13:49.501Z"
      },
      "title": "Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence",
      "descriptions": [
        {
          "lang": "en",
          "value": "Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nGazelle incorrectly prioritizes \"Content-Length\" over \"Transfer-Encoding: chunked\" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.\n\nAn attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy."
        }
      ],
      "affected": [
        {
          "vendor": "KAZEBURO",
          "product": "Gazelle",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "Gazelle",
          "programFiles": [
            "lib/Plack/Handler/Gazelle.pm",
            "lib/Plack/Handler/Gazelle.xs"
          ],
          "programRoutines": [
            {
              "name": "Plack::Handler::Gazelle::run"
            },
            {
              "name": "lib/Plack/Handler/Gazelle.xs::_parse_http_request"
            }
          ],
          "repo": "https://github.com/kazeburo/Gazelle",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "0.49"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')",
              "cweId": "CWE-444",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"
        },
        {
          "url": "https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch",
          "tags": [
            "patch"
          ]
        },
        {
          "url": "https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes",
          "tags": [
            "release-notes"
          ]
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-33",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-33 HTTP Request Smuggling"
            }
          ]
        }
      ],
      "workarounds": [
        {
          "lang": "en",
          "value": "Migrate to Starman version 0.4018 or newer which has fixed the issue.  Or apply the patch."
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to Gazelle 0.50 or later."
        }
      ],
      "timeline": [
        {
          "time": "2026-04-12T00:00:00.000Z",
          "lang": "en",
          "value": "Issue identified by CPANSec"
        },
        {
          "time": "2026-04-29T00:00:00.000Z",
          "lang": "en",
          "value": "Issue reported to software maintainer"
        },
        {
          "time": "2026-05-06T00:00:00.000Z",
          "lang": "en",
          "value": "Issue disclosed by CPANSec"
        },
        {
          "time": "2026-05-07T00:00:00.000Z",
          "lang": "en",
          "value": "Gazelle 0.50 released"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "CPANSec",
          "type": "finder"
        }
      ]
    },
    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-05-06T14:15:32.815Z"
        },
        "title": "CISA ADP Vulnrichment",
        "metrics": [
          {
            "cvssV3_1": {
              "version": "3.1",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
              "attackVector": "NETWORK",
              "attackComplexity": "LOW",
              "privilegesRequired": "NONE",
              "userInteraction": "NONE",
              "scope": "UNCHANGED",
              "confidentialityImpact": "NONE",
              "integrityImpact": "HIGH",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH"
            }
          },
          {}
        ]
      },
      {
        "providerMetadata": {
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE",
          "dateUpdated": "2026-05-06T16:32:45.619Z"
        },
        "title": "CVE Program Container",
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/06/7"
          }
        ]
      }
    ]
  }
}