CVE-2026-71890: Incorrect Authorization

In Bouncy Castle for Java before 1.86, validation of an MLS RFC 9420 external commit's proposal list, org.bouncycastle.mls.protocol.Group.validateExternalCachedProposals, counted the proposals by type and bounded the removed leaf index but never established that the removed leaf had anything to d...

CVE-2026-71892: Incorrect Comparison

In Bouncy Castle for Java before 1.86, the opt-in key-size validation on CMS key-transport recipients, org.bouncycastle.cms.jcajce.JceKeyTransRecipient.setKeySizeValidationtrue, never ran for a message using RFC 9709 content-encryption key derivation id-alg-cek-hkdf-sha256. The branch that should...

CVE-2026-71885: Improper Certificate Validation

In Bouncy Castle for Java before 1.86, the Messaging Layer Security MLS, RFC 9420 implementation did not bind an X.509 credential to a LeafNode's signaturekey. LeafNode.verify checked a leaf's signature against the signaturekey carried in the leaf itself, while the credential's X.509 certificate...

CVE-2026-71886: Incorrect Authorization

In Bouncy Castle for Java before 1.86, the high-level OpenPGP certificate API accepted a third-party certification or trust delegation from any component key of the issuing certificate, without requiring that component to have been granted the authority to certify...

CVE-2026-71888: Improper Validation of Integrity Check Value

In Bouncy Castle for Java before 1.86, the streaming CMS AuthenticatedData parser accepted a message whose digestAlgorithm and authAttrs fields disagreed about whether authenticated attributes were present. RFC 5652 sec. 9.1 pairs the two, requiring that authAttrs be present whenever...

CVE-2026-71889: Improper Certificate Validation

In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loo...

CVE-2026-85515: Improper Validation of Integrity Check Value

In Bouncy Castle for Java before 1.86, a truncated OpenPGP encrypted message was accepted with no error reported, and on the SEIPD version 1 path with no integrity check performed at all. RFC 9580 sec. 13.7 permits an implementation to release the cleartext of the fully authenticated chunks when...

PT-2026-104568

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description The high-level OpenPGP certificate API fails to verify if a component key of an issuing certificate has the required authority to certify when processing third-party certifications or...

PT-2026-104570

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description An issue exists in the BLS12 381BasicScheme.keyValidate function, affecting BLSPublicKeyParameters and the verify and aggregateVerify methods of BasicScheme, MessageAugmentation, and...

PT-2026-104566

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description HQC leaks secret-derived data through two side channels during encapsulation and decapsulation. The GF2^8 arithmetic uses lookup tables indexed by field elements, causing the touched...

PT-2026-104563

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Bouncy Castle for Java FIPS BC-FJA versions prior to bcpkix-fips 2.0.13 Bouncy Castle for Java FIPS BC-FJA versions prior to bcpkix-fips 2.1.13 Description Opt-in key-size validation for CMS...

PT-2026-104565

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Bouncy Castle for Java LTS versions prior to 2.73.13 Description Legacy PBES1 PKCS5 scheme 1 and PKCS12 PBE families in the raw JCA provider perform password-based key derivation using an iteration...

PT-2026-104567

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description The Messaging Layer Security MLS, RFC 9420 implementation fails to bind an X.509 credential to a LeafNode signature key. The LeafNode.verify function validates a leaf signature against...

PT-2026-104560

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description The high-level OpenPGP API incorrectly accepts data signatures from a signing subkey when the Subkey Binding signature lacks an embedded Primary Key Binding cross-certification signatur...

PT-2026-104561

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Bouncy Castle for Java LTS versions prior to 2.73.13 Bouncy Castle for Java FIPS BC-FJA bcpkix-fips versions prior to 1.0.13 Bouncy Castle for Java FIPS BC-FJA bcpkix-fips versions prior to 2.0.13...

PT-2026-104569

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Description Validation of an MLS RFC 9420 external commit's proposal list in the validateExternalCachedProposals function of org.bouncycastle.mls.protocol.Group failed to verify that a removed leaf...

PT-2026-104564

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Bouncy Castle for Java LTS versions prior to 2.73.13 Bouncy Castle for Java FIPS BC-FJA bcpg-fips versions prior to 1.0.14 Bouncy Castle for Java FIPS BC-FJA bcpg-fips versions prior to 2.0.14.1...

PT-2026-104562

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java versions prior to 1.86 Bouncy Castle for Java LTS versions prior to 2.73.13 Bouncy Castle for Java FIPS BC-FJA bcpkix-fips versions prior to 1.0.13 Bouncy Castle for Java FIPS BC-FJA bcpkix-fips versions prior to 2.0.13...

CVE-2026-71887: Improper Verification of Cryptographic Signature

In Bouncy Castle for Java before 1.86, the high-level OpenPGP API accepted a data signature made by a signing subkey whose Subkey Binding signature carried no embedded Primary Key Binding cross-certification signature, in the case where that binding omits a Key Flags subpacket. RFC 9580 sec...

CVE-2026-97873: Allocation of Resources Without Limits or Throttling

In Bouncy Castle for Java before 1.86, the raw JCA provider's legacy PBES1 PKCS5 scheme 1 and PKCS12 PBE families ran their password-based key derivation with an iteration count taken from untrusted input without bounding it, so a small input could dictate an arbitrary amount of work before...