CWE-436

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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-pj7v-xfvx-wmjq"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.hex.pm",
          "cpes": [
            "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
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          "packageName": "hackney",
          "packageURL": "pkg:hex/hackney",
          "product": "hackney",
          "programFiles": [
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          ],
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          "vendor": "benoitc",
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          "defaultStatus": "unaffected",
          "modules": [
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          "packageName": "benoitc/hackney",
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Ganbagana"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Benoit Chesneau"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Jonatan M\u00e4nnchen / EEF"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery.\u003cp\u003e\u003ctt\u003ehackney_url:normalize/2\u003c/tt\u003e URL-decodes the host component after the URL has been parsed into a \u003ctt\u003e#hackney_url{}\u003c/tt\u003e record. OTP\u0027s \u003ctt\u003euri_string:parse/1\u003c/tt\u003e and \u003ctt\u003einet:parse_address/1\u003c/tt\u003e do not decode percent-escapes in the host, so a URL such as \u003ctt\u003ehttp://%31%32%37%2E%30%2E%30%2E%31/\u003c/tt\u003e is seen by a caller\u0027s allowlist validator with host \u003ctt\u003e%31%32%37%2E%30%2E%30%2E%31\u003c/tt\u003e (not an IP address), which passes the allowlist check. hackney\u0027s normalizer then decodes the host to \u003ctt\u003e127.0.0.1\u003c/tt\u003e and opens a TCP connection to loopback. Because \u003ctt\u003ehackney:request/5\u003c/tt\u003e always calls \u003ctt\u003ehackney_url:normalize/2\u003c/tt\u003e with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost.\u003c/p\u003e\u003cp\u003eThis issue affects hackney: from 0.13.0 before 4.0.1.\u003c/p\u003e"
            }
          ],
          "value": "Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP\u0027s uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host, so a URL such as http://%31%32%37%2E%30%2E%30%2E%31/ is seen by a caller\u0027s allowlist validator with host %31%32%37%2E%30%2E%30%2E%31 (not an IP address), which passes the allowlist check. hackney\u0027s normalizer then decodes the host to 127.0.0.1 and opens a TCP connection to loopback. Because hackney:request/5 always calls hackney_url:normalize/2 with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost.\n\nThis issue affects hackney: from 0.13.0 before 4.0.1."
        }
      ],
      "impacts": [
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          "capecId": "CAPEC-664",
          "descriptions": [
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              "lang": "en",
              "value": "CAPEC-664 Server Side Request Forgery"
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        }
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      "metrics": [
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          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N",
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            "vulnIntegrityImpact": "NONE"
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          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
            }
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "CWE-436 Interpretation Conflict",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918 Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
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          ]
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      "providerMetadata": {
        "dateUpdated": "2026-05-27T15:41:17.845Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
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            "related"
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          "url": "https://github.com/benoitc/hackney/security/advisories/GHSA-pj7v-xfvx-wmjq"
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          "tags": [
            "related"
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          "url": "https://cna.erlef.org/cves/CVE-2026-47076.html"
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          "tags": [
            "related"
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          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-47076"
        },
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          "tags": [
            "patch"
          ],
          "url": "https://github.com/benoitc/hackney/commit/452620a92ec1da2e6b4862a049a2a4f04b42068f"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "SSRF allowlist bypass via percent-encoded host in hackney",
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      }
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    "assignerShortName": "EEF",
    "cveId": "CVE-2026-47076",
    "datePublished": "2026-05-25T14:00:46.707Z",
    "dateReserved": "2026-05-18T17:28:10.319Z",
    "dateUpdated": "2026-05-27T15:41:17.845Z",
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