Use-after-free in PQC hybrid key-share handling

{
  "id": "0066ea21956e8f69724a33840819ec08d28548fdd204a34a513ce1615959f7e6",
  "url": "https://osv.dev/vulnerability/CVE-2026-7531",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Use-after-free in PQC hybrid key-share handling",
    "summary": "Use-after-free in PQC hybrid key-share handling. This is an incomplete-fix follow-up to CVE-2026-5460 (released in 5.9.1): a malicious TLS 1.3 server sending a truncated PQC hybrid KeyShare can still trigger the error cleanup path to operate on freed memory.",
    "evidence": "osv:CVE-2026-7531",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-7531",
      "aliases": [
        "CVE-2026-7531"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wolfssl/wolfssl",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b077c81eb635392e694ccedbab8b644297ec0285"
                },
                {
                  "fixed": "ac01707f552c611fbd135cc723b2682b3e7f80f2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.8.0"
                      },
                      {
                        "last_affected": "5.9.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.8.0"
                      },
                      {
                        "fixed": "5.9.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.9.1-stable",
            "v5.9.0-stable",
            "v5.8.4-stable",
            "wolfEntropy2d",
            "v5.8.2-stable",
            "v5.8.0-stable"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-7531.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.156497771Z",
      "provider": "osv",
      "references": [
        "https://www.wolfssl.com/docs/security-vulnerabilities/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7531.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-7531",
        "https://github.com/wolfSSL/wolfssl/pull/10327",
        "https://github.com/wolfSSL/wolfssl"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "wolfSSL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7531.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-7531",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517506,
  "published_at": "2026-06-25T20:01:16.991+00:00"
}