CVE-2026-5507 (GCVE-0-2026-5507)

Vulnerability from cvelistv5 – Published: 2026-04-09 22:18 – Updated: 2026-04-09 22:18
VLAI?
Title
Session Cache Restore — Arbitrary Free via Deserialized Pointer
Summary
When restoring a session from cache, a pointer from the serialized session data is used in a free operation without validation. An attacker who can poison the session cache could trigger an arbitrary free. Exploitation requires the ability to inject a crafted session into the cache and for the application to call specific session restore APIs.
Severity ?
4.1 (Medium)
CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-502 - Deserialization of untrusted data
Assigner
References
Impacted products
Vendor Product Version
wolfSSL wolfSSL Affected: 0 , ≤ 5.9.0 (semver)
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Credits
Sunwoo Lee (Korea Institute of Energy Technology, KENTECH) Woohyun Choi (Korea Institute of Energy Technology, KENTECH) Seunghyun Yoon (Korea Institute of Energy Technology, KENTECH)
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        {
          "defaultStatus": "unaffected",
          "modules": [
            "wolfSSL_memrestore_session_cache"
          ],
          "product": "wolfSSL",
          "programFiles": [
            "src/ssl_sess.c"
          ],
          "vendor": "wolfSSL",
          "versions": [
            {
              "lessThanOrEqual": "5.9.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
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      ],
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          "type": "finder",
          "value": "Sunwoo Lee (Korea Institute of Energy Technology, KENTECH)"
        },
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          "type": "finder",
          "value": "Woohyun Choi (Korea Institute of Energy Technology, KENTECH)"
        },
        {
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          "type": "finder",
          "value": "Seunghyun Yoon (Korea Institute of Energy Technology, KENTECH)"
        }
      ],
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            }
          ],
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 4.1,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "format": "CVSS",
          "scenarios": [
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              "value": "GENERAL"
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-502 Deserialization of untrusted data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-09T22:18:44.067Z",
        "orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "shortName": "wolfSSL"
      },
      "references": [
        {
          "url": "https://github.com/wolfSSL/wolfssl/pull/10088"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Session Cache Restore \u2014 Arbitrary Free via Deserialized Pointer",
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  "cveMetadata": {
    "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
    "assignerShortName": "wolfSSL",
    "cveId": "CVE-2026-5507",
    "datePublished": "2026-04-09T22:18:44.067Z",
    "dateReserved": "2026-04-03T16:40:00.883Z",
    "dateUpdated": "2026-04-09T22:18:44.067Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.