{
  "id": "CVE-2026-34183",
  "url": "https://spydr.io/cve/CVE-2026-34183",
  "published": "2026-06-09T17:17:05.000Z",
  "modified": "2026-07-23T08:10:00.137Z",
  "score": 7.5,
  "severity": "high",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "score_source": "CISA ADP",
  "epss": 0.01049,
  "epss_percentile": 0.63056,
  "exploited": false,
  "kev": null,
  "ssvc_exploitation": "none",
  "vendors": [
    "OpenSSL"
  ],
  "products": [
    "OpenSSL"
  ],
  "cwes": [
    "CWE-1325"
  ],
  "description": "Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with packets containing PATH_CHALLENGE frames. Impact summary: A malicious remote peer can cause an unbounded memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or server and a Denial of Service. A remote peer may exhaust heap memory by flooding the local QUIC stack with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception of the PATH_RESPONSE frame which will not be done by a malicious peer. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.",
  "status": "Analyzed",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 7.5,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://github.com/openssl/openssl/commit/5b306efb0b3779dfdd0803b4afc9d08c91f11517",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/openssl/openssl/commit/7d06955ebe0ecf8adfd4c1e92018586da47ef9ac",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/openssl/openssl/commit/d2e9efbe4900a373227deb136e8665401404ffac",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/openssl/openssl/commit/fbaa83859c01ad64f497b757aaf51be7d05ed9eb",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://openssl-library.org/news/secadv/20260609.txt",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34183",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}