{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "3.4.0"
              },
              {
                "fixed": "3.4.6"
              },
              {
                "introduced": "3.5.0"
              },
              {
                "fixed": "3.5.7"
              },
              {
                "introduced": "3.6.0"
              },
              {
                "fixed": "3.6.3"
              },
              {
                "introduced": "4.0.0-NA"
              },
              {
                "last_affected": "4.0.0-NA"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "98acb6b02839c609ef5b837794e08d906d965335"
            },
            {
              "fixed": "c5ea1cc227fd60afae8ac4b9438690bbe4888f79"
            },
            {
              "introduced": "636dfadc70ce26f2473870570bfd9ec352806b1d"
            },
            {
              "fixed": "8cf17aaeb4599f8af87fefd810b5b5fee90fe69e"
            },
            {
              "introduced": "7b371d80d959ec9ab4139d09d78e83c090de9779"
            },
            {
              "fixed": "aae016bfd52fcad2bc9657c2c782cfdf73b1ed5f"
            },
            {
              "introduced": "11b7b6ea3b65a584e1d31408ed1bdb139465cffd"
            },
            {
              "fixed": "5b306efb0b3779dfdd0803b4afc9d08c91f11517"
            },
            {
              "fixed": "7d06955ebe0ecf8adfd4c1e92018586da47ef9ac"
            },
            {
              "fixed": "d2e9efbe4900a373227deb136e8665401404ffac"
            },
            {
              "fixed": "fbaa83859c01ad64f497b757aaf51be7d05ed9eb"
            }
          ],
          "repo": "https://github.com/openssl/openssl",
          "type": "GIT"
        }
      ],
      "versions": [
        "4.0.0-NA"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "openssl",
    "cwe_ids": [
      "CWE-1325"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34183.json"
  },
  "details": "Issue summary: Remote peer may exhaust heap memory of the QUIC\nserver or client by flooding it with packets containing PATH_CHALLENGE\nframes.\n\nImpact summary: A malicious remote peer can cause an unbounded\nmemory allocation which can lead to an abnormal termination of the\napplication acting as a QUIC client or server and a Denial of Service.\n\nA remote peer may exhaust heap memory by flooding the local\nQUIC stack with PATH_CHALLENGE frames. The local QUIC stack\nallocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives.\nThe allocated PATH_RESPONSE frame gets freed only when the remote\npeer acknowledges reception of the PATH_RESPONSE frame which will\nnot be done by a malicious peer.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by\nthis issue. The QUIC stack is outside of OpenSSL FIPS module\nboundary.",
  "id": "CVE-2026-34183",
  "modified": "2026-07-25T03:56:17.339284785Z",
  "published": "2026-06-09T16:03:23.623Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34183.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34183"
    },
    {
      "type": "ADVISORY",
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler"
}