{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "5df5a74a2817d5b12880d217db33253ff1fae1b5"
                  },
                  {
                    "fixed": "5ee7d7d19eba27e774667d472feb1e93a08af7f9"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "range": [
                  {
                    "introduced": "2.0.0"
                  },
                  {
                    "fixed": "4.9.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              },
              {
                "original_tag": "4.9.0",
                "range": [
                  {
                    "fixed": "0f5db333d43600e7b9fb9346143b4e9fdb8924ea"
                  }
                ],
                "source": "REFERENCES_TAG"
              },
              {
                "range": [
                  {
                    "fixed": "5df5a74a2817d5b12880d217db33253ff1fae1b5"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "5ee7d7d19eba27e774667d472feb1e93a08af7f9"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              }
            ]
          },
          "events": [
            {
              "introduced": "5df5a74a2817d5b12880d217db33253ff1fae1b5"
            },
            {
              "fixed": "5ee7d7d19eba27e774667d472feb1e93a08af7f9"
            },
            {
              "introduced": "a7ce34b42892ab305b2ef7dbe873bcabf4ef93ca"
            },
            {
              "fixed": "0f5db333d43600e7b9fb9346143b4e9fdb8924ea"
            },
            {
              "fixed": "5df5a74a2817d5b12880d217db33253ff1fae1b5"
            }
          ],
          "repo": "https://github.com/benoitc/hackney",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-113"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112880.json"
  },
  "details": "Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in hackney_http_connect in benoitc hackney allows HTTP Request Splitting via the value a proxy_auth_fun callback returns. After a 407 response from an HTTP CONNECT proxy, hackney_http_connect:handle_proxy_auth/11 calls the caller's proxy_auth_fun with the status code and the response headers and writes the returned binary into the Proxy-Authorization line of the CONNECT retry without checking it. A CR, LF or NUL byte in that value adds header lines to the request sent to the proxy.\n\nThe value is attacker-influenced when the callback derives it from untrusted data, for example from the proxy's challenge headers. Other caller-supplied values on the CONNECT path, such as the target host and the request headers, were already checked for control bytes.\n\nThis issue affects hackney: from 2.0.0 before 4.9.0.",
  "id": "CVE-2026-112880",
  "modified": "2026-11-11T10:30:55.017265063Z",
  "published": "2026-10-26T13:48:46.589Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-112880.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-112880"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112880.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/benoitc/hackney/releases/tag/4.9.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112880"
    },
    {
      "type": "FIX",
      "url": "https://github.com/benoitc/hackney/commit/5df5a74a2817d5b12880d217db33253ff1fae1b5"
    },
    {
      "type": "FIX",
      "url": "https://github.com/benoitc/hackney/commit/5ee7d7d19eba27e774667d472feb1e93a08af7f9"
    },
    {
      "type": "FIX",
      "url": "https://github.com/benoitc/hackney/pull/989"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/benoitc/hackney"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "CRLF injection in Proxy-Authorization header built from proxy_auth_fun in hackney"
}