UBUNTU-CVE-2026-18040

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-2026-71891 BLS12-381 key validation accepts a public key built on a foreign curve

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-2026-71891 BLS12-381 key validation accepts a public key built on a foreign curve

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-2026-71891 BLS12-381 key validation accepts a public key built on a foreign curve

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-2026-18040 HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler

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-2026-18040 HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler

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-2026-18040 HQC leaks private key information through secret-indexed GF(2^8) tables and a secret-dependent fixed-weight sampler

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...

EUVD-2026-92004

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-2026-71883

In Bouncy Castle for Java LTS before version 2.73.13 , one-shot native packet ciphers (AES-CBC, CCM, CFB, CTR, GCM, and GCM-SIV) suffer from a memory management flaw. The native code uses JNI's ReleaseByteArrayElements in mode 0, which commits native copies back into Java arrays. If an applicatio...

CVE-2026-71892 CMS key-transport recipient key-size validation never runs for RFC 9709 HKDF-derived keys

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-2026-71892

Bouncy Castle for Java versions before 1.86 contain a flaw where opt-in key-size validation on CMS key-transport recipients fails for messages using RFC 9709 content-encryption key derivation (id-alg-cek-hkdf-sha256 ). The root cause is an incorrect comparison between a byte array and an ASN1Obje...

EUVD-2026-91989

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-2026-71892 CMS key-transport recipient key-size validation never runs for RFC 9709 HKDF-derived keys

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-2026-71892 CMS key-transport recipient key-size validation never runs for RFC 9709 HKDF-derived keys

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-2026-71892

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-2026-97873

The Bouncy Castle for Java library (before versions 1.86 and LTS 2.73.13 ) contains a vulnerability where the raw JCA provider's legacy PBES1 and PKCS#12 PBE families derive keys using an iteration count from untrusted input without bounding. An attacker could provide a small input to dictate an ...

EUVD-2026-91987

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...

CVE-2026-92826 EWWW Image Optimizer <= 8.7.7 - Reflected Cross-Site Scripting via REQUEST_URI Parameter Key

The EWWW Image Optimizer plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via REQUESTURI Parameter Key in all versions up to, and including, 8.7.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitra...

CVE-2026-92826

The EWWW Image Optimizer plugin for WordPress is vulnerable to Reflected Cross-Site Scripting (XSS) in all versions up to and including 8.7.7 . The root cause is insufficient input sanitization and output escaping within the REQUEST_URI Parameter Key . An unauthenticated attacker can inject arbit...

CVE-2026-92826 EWWW Image Optimizer <= 8.7.7 - Reflected Cross-Site Scripting via REQUEST_URI Parameter Key

The EWWW Image Optimizer plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via REQUESTURI Parameter Key in all versions up to, and including, 8.7.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitra...