EUVD-2026-91206

Exposure of the message authentication key through the encryption keystream in the stream mode of IesEngine an IesEngine constructed without a block cipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who has observed one encrypted message with known plainte...

CVE-2026-16001

The Bouncy Castle Inc. bc-csharp library (versions before 2.7.0 ) is vulnerable to a message authentication key exposure in the IesEngine stream mode. Specifically, when an IesEngine is constructed without a block cipher, the MAC key is taken from the key derivation output immediately following a...

CVE-2026-16000

The bc-csharp library (before version 2.7.0 ) by Legion of the Bouncy Castle Inc. contains a missing cryptographic step in the DSTU 7624 CCM mode implementation (KCcmBlockCipher ). The vulnerability occurs because the G1 block , which is responsible for binding the nonce , message length, and par...

CVE-2026-16000 KCcmBlockCipher (DSTU 7624 CCM) tag not bound to nonce when no associated data is used

Missing cryptographic step in the DSTU 7624 CCM mode implementation KCcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypt...

EUVD-2026-91205

Missing cryptographic step in the DSTU 7624 CCM mode implementation KCcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypt...

CVE-2026-15999

The bc-csharp library by Bouncy Castle Inc. is vulnerable to improper validation of integrity check values in its AES-CCM implementation in versions before 2.7.0 . The CcmParameters class accepts arbitrary values for the authentication tag (aes-ICVlen), and CcmBlockCipher only validates this leng...

CVE-2026-15999 AES-CCM decryption accepts zero or out-of-range tag length, bypassing authentication

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 declar...

CVE-2026-15999 AES-CCM decryption accepts zero or out-of-range tag length, bypassing authentication

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 declar...

EUVD-2026-91204

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 declar...

PT-2026-104123

Improper certificate validation in PkixNameConstraintValidator in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who controls, or can obtain certificates from, a name-constrained intermediate CA to have certificates accepted during PKIX certification path validation fo...

PT-2026-104106

Allocation of resources without limits or throttling in the CMP/CRMF password-based MAC verifier PKMacBuilder in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote unauthenticated attacker to cause a denial of service through CPU exhaustion via a CMP message or CRMF certifica...

PT-2026-104133

Memory allocation with excessive size value in the OpenPGP signature and user attribute subpacket parsers SignatureSubpacketsParser.ReadPacket, UserAttributeSubpacketsParser.ReadPacket in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote, unauthenticated attacker who can...

PT-2026-104132

Observable discrepancy in the CMS RSA PKCS1 v1.5 key-transport unwrap KeyTransRecipientInformation.UnwrapKey in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who holds a captured CMS EnvelopedData message, and who can submit many modified messages to an...

PT-2026-104101

Missing cryptographic step in the DSTU 7624 CCM mode implementation KCcmBlockCipher in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypt...

PT-2026-104137

Allocation of resources without limits in password-based private-key decryption PbeUtilities.GenerateCipherParameters in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply an encrypted private key, such as a PKCS8 EncryptedPrivateKeyInfo or "ENCRYPTED PRIVAT...

PT-2026-104107

Improper input validation in DHAgreement.CalculateAgreement MTI/A0 two-pass Diffie-Hellman in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an on-path attacker to make the local party compute an agreed value the attacker already knows, defeating the key authentication MTI/A0 is...

PT-2026-104134

Loop with unreachable exit condition in the PKCS12 key derivation Pkcs12ParametersGenerator in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS12 PFX file, or a PKCS8 encrypted private key that uses a PKCS12 password-based encryption algorithm, to...

PT-2026-104129

Loop with unreachable exit condition in Pkcs12Store.GetCertificateChain in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a crafted PKCS12 file to an application that loads it and requests a key entry's certificate chain to cause a denial of service, in...

PT-2026-104122

Release of unverified plaintext in the CCM CcmBlockCipher and DSTU 7624 CCM KCcmBlockCipher AEAD modes in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker to obtain decryptions of ciphertexts of their choosing via forged messages sent to an application that lets th...

PT-2026-104105

Observable discrepancy in IesEngine.DecryptBlock in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker who has captured an IES or ECIES ciphertext, and who can submit modified ciphertexts for decryption under the same key pair, to recover its plaintext via a CBC...