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CVE-2026-15999

🗓️ 02 Oct 2026 06:52:16Reported by bcorgType 
cve
 cve
🔗 web.nvd.nist.gov👁 2 Views

Improper integrity check validation in Bouncy Castle bc-csharp allows content modification.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
cvelist
Cvelist
CVE-2026-15999 AES-CCM decryption accepts zero or out-of-range tag length, bypassing authentication
2 Oct 202606:52
–cvelist
euvd
EUVD
EUVD-2026-91204
2 Oct 202606:52
–euvd
nvd
NVD
CVE-2026-15999
2 Oct 202607:16
–nvd
ptsecurity
Positive Technologies
PT-2026-104100
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/asn1/cms/CcmParameters.cs",
      "crypto/src/crypto/modes/CcmBlockCipher.cs"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "2.7.0",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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02 Oct 2026 07:16Current
5.9Medium risk
Vulners AI Score5.9
CVSS 48.2
EPSS0.00227
2