CVE-2026-18040: Observable Timing Discrepancy

In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field elements, making the cache line touched a function of the operand, and its fixed-weight support sampler left its duplicate scan as soon as a...

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-2026-71889: 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-2026-71891: Improper Verification of Cryptographic Signature

In Bouncy Castle for Java before 1.86, BLS12381BasicScheme.keyValidate, and so BLSPublicKeyParameters and every BasicScheme, MessageAugmentation and ProofOfPossession verify and aggregateVerify that gate on it, accepted a public key built on a foreign ECCurve that merely shares BLS12-381's field...

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-2026-71890: 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-2026-85515: 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...

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...

Linux Distros Unpatched Vulnerability : CVE-2026-17507

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Bouncy Castle for Java before 1.86, the MLS implementation org.bouncycastle.mls holds RFC 9420's uint32 leafindex in a signed int, so a wire value with the t...

Linux Distros Unpatched Vulnerability : CVE-2026-71889

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy...

Linux Distros Unpatched Vulnerability : CVE-2026-18040

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Bouncy Castle for Java before 1.86, HQC leaked secret-derived data through two side channels: its GF2^8 arithmetic used lookup tables indexed by field...

Linux Distros Unpatched Vulnerability : CVE-2026-85515

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

Linux Distros Unpatched Vulnerability : CVE-2026-18036

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Bouncy Castle for Java before 1.86, NTRU reduced secret values with the % operator in three helpers whose reference implementations are deliberately...

PT-2026-104559

Name of the Vulnerable Software and Affected Versions Bouncy Castle for Java LTS versions prior to 2.73.13 Description One-shot native packet ciphers for AES-CBC, CCM, CFB, CTR, GCM, and GCM-SIV incorrectly use JNI's ReleaseByteArrayElements in mode 0 when releasing the caller's key, IV, and...

Linux Distros Unpatched Vulnerability : CVE-2026-71887

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

Linux Distros Unpatched Vulnerability : CVE-2026-71886

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

Linux Distros Unpatched Vulnerability : CVE-2026-71885

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

Linux Distros Unpatched Vulnerability : CVE-2026-17508

"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Bouncy Castle for Java before 1.86, several password-based key derivation entry points ran the KDF with cost parameters taken from the untrusted input being...

Linux Distros Unpatched Vulnerability : CVE-2026-71890

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In Bouncy Castle for Java before 1.86, validation of an MLS RFC 9420 external commit's proposal list,...