RUSTSEC-2026-0240 Ed25519 identity public keys permit universal signature forgery

All published versions of dcrypt-sign before 2.0.0 accepted the Edwards identity as an Ed25519 public key. A signature with R = B and S = 1 then verified for every message because the challenge term multiplied the identity. The implementation also admitted other noncanonical or small-order inputs...

RUSTSEC-2026-0238 Low-level GCM ignores the operation nonce

In all published versions of dcrypt-algorithms before 2.0.0, the low-level Gcm builder required an operation nonce but derived J0 from the nonce captured by the original Gcm constructor. Multiple operations could therefore silently reuse a nonce even when callers supplied distinct values,...

Streaming AEAD does not authenticate stream structure

In all published versions of dcrypt-symmetric before 2.0.0, version-1 GCM and ChaCha20-Poly1305 streams used unauthenticated terminator, counter, and length fields. Decryptors trusted transmitted counters, allocated from unbounded lengths, and discarded plaintext that did not fit a caller's singl...

Ed25519 identity public keys permit universal signature forgery

All published versions of dcrypt-sign before 2.0.0 accepted the Edwards identity as an Ed25519 public key. A signature with R = B and S = 1 then verified for every message because the challenge term multiplied the identity. The implementation also admitted other noncanonical or small-order inputs...

Safe ErrorRegistry APIs can cause undefined behavior

All published versions of dcrypt-api before 2.0.0 exposed safe ErrorRegistry operations that could trigger undefined behavior when the default std feature was enabled. Stored Box values were erased to raw pointers and later deallocated as Box. The geterror operation also performed an unchecked ca...

PT-2026-76518

In all published versions of dcrypt-algorithms before 2.0.0, the low-level Gcm builder required an operation nonce but derived J0 from the nonce captured by the original Gcm constructor. Multiple operations could therefore silently reuse a nonce even when callers supplied distinct values,...

PT-2026-76522

All published versions of dcrypt-api before 2.0.0 exposed safe ErrorRegistry operations that could trigger undefined behavior when the default std feature was enabled. Stored Box values were erased to raw pointers and later deallocated as Box. The get error operation also performed an unchecked...

PT-2026-76519

In all published versions of dcrypt-symmetric before 2.0.0, version-1 GCM and ChaCha20-Poly1305 streams used unauthenticated terminator, counter, and length fields. Decryptors trusted transmitted counters, allocated from unbounded lengths, and discarded plaintext that did not fit a caller's singl...

PT-2026-76520

All published versions of dcrypt-sign before 2.0.0 accepted the Edwards identity as an Ed25519 public key. A signature with R = B and S = 1 then verified for every message because the challenge term multiplied the identity. The implementation also admitted other noncanonical or small-order inputs...

Open-Xchange: Missing (or redundant) null check in `dcrypt_openssl_sign`

Function dcryptopensslsign in file src/lib-dcrypt/dcrypt-openssl.c has the following code if EVPPKEYbaseidkey-key == EVPPKEYRSA errorr = "Format does not support RSA"; return FALSE; and later if md == NULL if errorr != NULL errorr = tstrdupprintf "Unknown digest %s", algorithm; return FALSE; So,...