Security advisory

{
  "id": "3ed42bbc3ca4a043813196dbd06624e73f8becd95d8e77d8214ac774b9203610",
  "url": "https://osv.dev/vulnerability/CVE-2026-76956",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-76956",
    "summary": "In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.",
    "evidence": "osv:CVE-2026-76956",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-76956",
      "aliases": [
        "CVE-2026-76956"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libexpat/libexpat",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c61098da494eea1cbd091118118dcee417faacea"
                },
                {
                  "fixed": "12cf0b1f25f026a022fe728ad8f7e3d017285b80"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.8.2"
                      },
                      {
                        "fixed": "2.8.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.8.2"
                      },
                      {
                        "fixed": "2.8.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "R_2_8_3",
            "R_2_8_2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76956.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.808703245Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76956.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-76956",
        "https://github.com/libexpat/libexpat/pull/1326",
        "https://github.com/libexpat/libexpat/pull/1329"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-394"
        ],
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76956.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-76956",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488259,
  "published_at": "2026-08-20T04:22:51.381+00:00"
}