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-2026-63574 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 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...

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...

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...

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...

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...

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-2026-91223

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...

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...

CVE-2026-63570 Pkcs12Store.GetCertificateChain loops forever on cyclic issuer links

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...

CVE-2026-63570 Pkcs12Store.GetCertificateChain loops forever on cyclic issuer links

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...

CVE-2026-63570

The bc-csharp library by Legion of the Bouncy Castle Inc. (versions before 2.7.0 ) is vulnerable to a denial of service (DoS) via an infinite loop in Pkcs12Store.GetCertificateChain . An attacker can provide a crafted PKCS#12 file containing certificates with cyclic issuer links —such as two cert...

EUVD-2026-91221

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...

CVE-2026-63570 Pkcs12Store.GetCertificateChain loops forever on cyclic issuer links

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...