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CVE-2026-103603 Unbounded HSS public key level count allows huge array allocation during signature verification

🗓️ 02 Oct 2026 07:10:34Reported by bcorgType 
cvelist
 cvelist
🔗 www.cve.org👁 3 Views

Unauthenticated DoS in Bouncy Castle bc-csharp via memory exhaustion in HSS signature code.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
cve
CVE
CVE-2026-103603
2 Oct 202600:00
–cve
euvd
EUVD
EUVD-2026-91233
2 Oct 202609:31
–euvd
nvd
NVD
CVE-2026-103603
2 Oct 202608:17
–nvd
ptsecurity
Positive Technologies
PT-2026-104124
2 Oct 202600:00
–ptsecurity
[
  {
    "vendor": "Legion of the Bouncy Castle Inc.",
    "product": "bc-csharp",
    "collectionURL": "https://www.nuget.org/packages/BouncyCastle.Cryptography",
    "packageName": "BouncyCastle.Cryptography",
    "repo": "https://github.com/bcgit/bc-csharp",
    "programFiles": [
      "crypto/src/pqc/crypto/lms/HSSPublicKeyParameters.cs",
      "crypto/src/pqc/crypto/lms/HSSSignature.cs"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "2.7.0",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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