CVE-2026-63578

The bc-csharp library (versions before 2.7.0 ) by Legion of the Bouncy Castle Inc. is vulnerable to a denial of service via CPU exhaustion in the PbeUtilities.GenerateCipherParameters function. This is caused by the allocation of resources without limits during password-based private-key decrypti...

EUVD-2026-91229

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...

EUVD-2026-91228

Improper certificate validation in the directoryName name-constraint check PkixNameConstraintValidator.WithinDNSubtree in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who controls, or can have certificates issued by, a name-constrained intermediate CA to get...

CVE-2026-63577

The bc-csharp library (versions before 2.7.0 ) by Legion of the Bouncy Castle Inc. contains an improper certificate validation flaw in the PkixNameConstraintValidator.WithinDNSubtree check. The root cause is that the validator identifies the first Relative Distinguished Name (RDN) of a constraint...

CVE-2026-63576

The bc-csharp library by Legion of the Bouncy Castle Inc. (versions before 2.7.0 ) contains an improper certificate validation vulnerability in the PkixNameConstraintValidator (specifically the ExtractHostFromURL function). The root cause is that the software extracts the host from a URI using st...

EUVD-2026-91227

Improper certificate validation in PkixNameConstraintValidator ExtractHostFromURL in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a name-constrained subordinate CA, or anyone able to obtain certificates with chosen subjectAltName URIs from such a CA, to bypass permitted or...

EUVD-2026-91226

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...

CVE-2026-63575

The Bouncy Castle Inc. bc-csharp library (versions before 2.7.0 ) is vulnerable to a Denial of Service (DoS) attack due to a loop with an unreachable exit condition in the Pkcs12ParametersGenerator component. An attacker can provide a PKCS#12 (PFX) file or a PKCS#8 encrypted private key using a P...

CVE-2026-63575 PKCS#12 key derivation loops about 2^32 times on a zero or negative iteration count

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...

CVE-2026-63574 Unbounded allocation from OpenPGP signature and user attribute subpacket lengths

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...

CVE-2026-63574

The bc-csharp library (versions before 2.7.0 ) by Legion of the Bouncy Castle Inc. contains a memory allocation vulnerability in the OpenPGP signature and user attribute subpacket parsers (SignatureSubpacketsParser.ReadPacket , UserAttributeSubpacketsParser.ReadPacket ). A remote, unauthenticated...

EUVD-2026-91225

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...

CVE-2026-63573

A Bleichenbacher-style adaptive chosen-ciphertext attack exists in Legion of the Bouncy Castle Inc. bc-csharp versions before 2.7.0 . The vulnerability is located in the CMS RSA PKCS#1 v1.5 key-transport unwrap (KeyTransRecipientInformation.UnwrapKey) component. Because the system rejects ciphert...

EUVD-2026-91224

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...

CVE-2026-63573 Bleichenbacher padding oracle in CMS RSA PKCS#1 v1.5 key-transport unwrap

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...

EUVD-2026-91223

Allocation of resources without limits in PKCS12 keystore loading Pkcs12Store.Load in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS12 PFX file to cause a denial of service through CPU exhaustion via an iteration count close to 2^31 in the file's...

CVE-2026-63572

The bc-csharp library by Legion of the Bouncy Castle Inc. is vulnerable to a denial of service via CPU exhaustion in versions prior to 2.7.0 . The root cause is the allocation of resources without limits during PKCS#12 keystore loading (Pkcs12Store.Load ) and within Pkcs12Utilities.ConvertToDefin...

CVE-2026-63572 Unbounded MAC and bag-decryption iteration counts when loading PKCS#12 files

Allocation of resources without limits in PKCS12 keystore loading Pkcs12Store.Load in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS12 PFX file to cause a denial of service through CPU exhaustion via an iteration count close to 2^31 in the file's...

EUVD-2026-91222

Improper verification of cryptographic signature in the attribute certificate path validator PkixAttrCertPathValidator, also used by PkixAttrCertPathBuilder in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker to have a forged X.509 attribute certificate accepted as...

CVE-2026-63571 Attribute certificate path validation does not verify the attribute certificate's signature

Improper verification of cryptographic signature in the attribute certificate path validator PkixAttrCertPathValidator, also used by PkixAttrCertPathBuilder in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attacker to have a forged X.509 attribute certificate accepted as...