Missing Cryptographic Step Affecting openssl package, versions [3.0.5,3.1.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-OPENSSL-17277004
- published10 Jun 2026
- disclosed9 Jun 2026
- creditAlex Gaynor
Introduced: 9 Jun 2026
NewCVE-2026-45446 (opens in a new tab)How to fix?
Upgrade openssl to version 3.1.0 or higher.
Overview
Affected versions of this package are vulnerable to Missing Cryptographic Step in the AES-SIV (RFC 5297) and AES-GCM-SIV (RFC 8452) provider cipher implementations. An attacker can forge an empty message with arbitrary AAD under a key they do not know, because the expected tag is computed only when the decryption update is invoked with non-empty data. When the caller supplies AAD and then calls EVP_DecryptFinal_ex() without a ciphertext update, which occurs when the received ciphertext length is zero, the tag is never recalculated and retains its all-zeros value. So an arbitrary AAD, empty ciphertext, and all-zeros tag pass authentication.
No protocol implemented in OpenSSL itself supports either cipher, so an attack requires an application that uses the EVP interface for its own protocol and skips the ciphertext update on an empty-ciphertext message.