CVE-2026-12816

IESEngine stream-mode MAC forgery via length-dependent KDF split

In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Bc-java and 1 more

CVE-2026-12803

KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery)

In Bouncy Castle for Java before 1.85, KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery). This issue also affects Bouncy Castle for Java LTS before 2.73.12.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Bc-java and 1 more

CVE-2026-12802

CMS AuthEnvelopedData fails to enforce tag-length on decryption

In Bouncy Castle for Java before 1.85, CMS AuthEnvelopedData fails to enforce tag-length on decryption. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcpkix-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-58063

BCFKS keystore load honours unbounded KDF cost from untrusted file

In Bouncy Castle for Java before 1.85, BCFKS keystore load honours unbounded KDF cost from untrusted file. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Fips Java Api and 3 more

CVE-2026-58062

Stapled OCSP response accepted without binding to the checked certificate

In Bouncy Castle for Java before 1.85, Stapled OCSP response accepted without binding to the checked certificate. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Fips Java Api and 3 more

CVE-2026-58061

CCM-family modes write plaintext to caller buffer before tag check

In Bouncy Castle for Java before 1.85, CCM-family modes write plaintext to caller buffer before tag check. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Fips Java Api and 3 more

CVE-2026-58060

HSS public-key level count unbounded, enabling huge allocation on verify

In Bouncy Castle for Java before 1.85, HSS public-key level count unbounded, enabling huge allocation on verify. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Fips Java Api and 3 more

CVE-2026-58059

Quadratic-time escaping when stringifying X.500 distinguished names

In Bouncy Castle for Java before 1.85, Quadratic-time escaping when stringifying X.500 distinguished names. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Fips Java Api and 3 more

CVE-2026-8763

Name Constraints bypass via trailing dot in rfc822Name and URI

In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Fips Java Api and 3 more

CVE-2026-59649

OpenPGP user-attribute subpacket length bounded only by JVM max memory

In Bouncy Castle for Java before 1.85, OpenPGP user-attribute subpacket length bounded only by JVM max memory. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcpg-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-59651

BKS keystore accepts legacy version with 16-bit integrity MAC key

In Bouncy Castle for Java before 1.85, BKS keystore accepts legacy version with 16-bit integrity MAC key. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Bc-java and 1 more

CVE-2026-59650

MTI/A0 DH agreement exponentiates unvalidated peer value

In Bouncy Castle for Java before 1.85, MTI/A0 DH agreement exponentiates unvalidated peer value. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bouncy Castle For Java Lts Bc-java and 1 more

CVE-2026-12817

OpenPGP AEAD decryption skips final tag on chunk-aligned data

In Bouncy Castle for Java before 1.85, OpenPGP AEAD decryption skips final tag on chunk-aligned data. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcpg-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-59645

OER parser recurses without depth limit on self-referential IEEE 1609.2 schema

In Bouncy Castle for Java before 1.85, OER parser recurses without depth limit on self-referential IEEE 1609.2 schema. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcutil-fips 2.0.7 (2.0.X series) and 2.1.7 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcutil-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-59646

DTLS handshake reassembler allocates buffer from unchecked 24-bit length

In Bouncy Castle for Java before 1.85, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bctls-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-59647

CRMF/CMP password-MAC honours unbounded iteration count

In Bouncy Castle for Java before 1.85, CRMF/CMP password-MAC honours unbounded iteration count. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcpkix-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-59648

OpenPGP Argon2 S2K honours attacker-chosen memory and passes

In Bouncy Castle for Java before 1.85, OpenPGP Argon2 S2K honours attacker-chosen memory and passes. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcpg-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-59642

CMS AuthenticatedData content not bound to MAC when authAttrs present

In Bouncy Castle for Java before 1.85, CMS AuthenticatedData content not bound to MAC when authAttrs present. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcpkix-fips Bouncy Castle For Java Lts and 3 more

CVE-2026-59641

S/MIME validator trusts signer-asserted signingTime for path validation

In Bouncy Castle for Java before 1.85, S/MIME validator trusts signer-asserted signingTime for path validation. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcmail-fips and bcjmail-fips 1.0.7 (1.0.X series), 2.0.7 (2.0.X series) and 2.1.7 (2.1.X series).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bcjmail-fips Bcmail-fips and 4 more

CVE-2026-59638

JSSE hostname verifier CN-fallback enabled by default despite documented opt-in

In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).

CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

Vendors

Bouncycastle Legion Of The Bouncy Castle Inc.

Products

Bc-java Bctls-fips Bouncy Castle For Java Lts and 3 more