CVE-2026-15999
- Source
- https://cve.org/CVERecord?id=CVE-2026-15999
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15999.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-15999
- Published
- 2026-10-02T06:52:16Z
- Modified
- 2026-10-29T02:48:31Z
- Severity
-
- 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- AES-CCM decryption accepts zero or out-of-range tag length, bypassing authentication
- Details
-
Improper validation of integrity check value in the AES-CCM implementation (CcmParameters and CcmBlockCipher) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an on-path attacker to modify CCM-encrypted content without detection via an AlgorithmIdentifier whose CCMParameters declare an authentication tag (aes-ICVlen) of zero or another length outside the RFC 5084 set, because CcmParameters accepted any value and CcmBlockCipher validated the tag length only when encrypting, so decryption compared a zero-length or very short tag. Affected paths include ParameterUtilities.GetCipherParameters, used by CmsEnvelopedData and CmsEnvelopedDataParser for EnvelopedData encrypted with AES-CCM, and any caller passing an unchecked tag length to CcmBlockCipher for decryption.
- Database specific
{ "cna_assigner": "bcorg", "cwe_ids": [ "CWE-354" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15999.json" }- References
-
- https://www.nuget.org/packages/BouncyCastle.Cryptography
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15999.json
- https://github.com/bcgit/bc-csharp/wiki/CVE-2026-15999
- https://nvd.nist.gov/vuln/detail/CVE-2026-15999
- https://github.com/bcgit/bc-csharp/commit/2818bdfa55efd58b0d6a1c75f360b8404d879780
- https://github.com/bcgit/bc-csharp/commit/9d284d8f379614def853b590c62bbb31c48f7af0
- https://github.com/bcgit/bc-csharp
Affected packages
Git / github.com/bcgit/bc-csharp
Affected ranges
- Type
- GIT
- Repo
- https://github.com/bcgit/bc-csharp
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "cpe": "cpe:2.3:a:bouncycastle:bc-csharp:*:*:*:*:*:*:*:*", "range": [ { "introduced": "0" }, { "fixed": "2.7.0" } ], "source": "CPE_RANGE" }, { "range": [ { "fixed": "2818bdfa55efd58b0d6a1c75f360b8404d879780" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "9d284d8f379614def853b590c62bbb31c48f7af0" } ], "source": "REFERENCES_COMMIT" } ] }