Heap buffer overflow in session parsing with wolfSSL_d2i_SSL_SESSION() function

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  "cveMetadata": {
    "cveId": "CVE-2026-2646",
    "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
    "assignerShortName": "wolfSSL",
    "dateUpdated": "2026-03-19T17:44:09.675Z",
    "dateReserved": "2026-02-17T22:29:37.732Z",
    "datePublished": "2026-03-19T17:25:42.810Z",
    "state": "PUBLISHED"
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        "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "shortName": "wolfSSL",
        "dateUpdated": "2026-03-19T17:25:42.810Z"
      },
      "title": "Heap buffer overflow in session parsing with wolfSSL_d2i_SSL_SESSION() function",
      "descriptions": [
        {
          "lang": "en",
          "value": "A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.",
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              "value": "A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds validation, allowing an attacker to overflow fixed-size buffers and corrupt heap memory. A maliciously crafted session would need to be loaded from an external source to trigger this vulnerability. Internal sessions were not vulnerable.<br><br>"
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "wolfssl",
          "product": "wolfssl",
          "programFiles": [
            "src/ssl_sess.c"
          ],
          "programRoutines": [
            {
              "name": "wolfSSL_d2i_SSL_SESSION"
            }
          ],
          "repo": "https://github.com/wolfSSL/wolfssl",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "5.8.4"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-122 Heap-based Buffer Overflow",
              "cweId": "CWE-122",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/wolfSSL/wolfssl/pull/9748"
        },
        {
          "url": "https://github.com/wolfSSL/wolfssl/pull/9949"
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-100",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-100 Overflow Buffers"
            }
          ]
        }
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          "lang": "en",
          "value": "Jonathan Bar Or (@yo_yo_yo_jbo)",
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          "dateUpdated": "2026-03-19T17:44:09.675Z"
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