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CVE-2026-31789 Heap Buffer Overflow in Hexadecimal Conversion

🗓️ 07 Apr 2026 22:00:54Reported by opensslType 
cvelist
 cvelist
🔗 www.cve.org👁 18 Views

Heap overflow converting large OCTET STRING to hex in certificate extensions on thirty two bit platforms; may crash or allow code execution.

Related
Affected
Refs
[
  {
    "defaultStatus": "unaffected",
    "product": "OpenSSL",
    "vendor": "OpenSSL",
    "versions": [
      {
        "lessThan": "3.6.2",
        "status": "affected",
        "version": "3.6.0",
        "versionType": "semver"
      },
      {
        "lessThan": "3.5.6",
        "status": "affected",
        "version": "3.5.0",
        "versionType": "semver"
      },
      {
        "lessThan": "3.4.5",
        "status": "affected",
        "version": "3.4.0",
        "versionType": "semver"
      },
      {
        "lessThan": "3.3.7",
        "status": "affected",
        "version": "3.3.0",
        "versionType": "semver"
      },
      {
        "lessThan": "3.0.20",
        "status": "affected",
        "version": "3.0.0",
        "versionType": "semver"
      }
    ]
  }
]

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