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CVE-2026-45445 is a cryptographic flaw in OpenSSL's AES-OCB implementation when invoked through the public EVP_Cipher() one-shot interface. The OCB provider's one-shot handler fails to apply the caller-supplied initialization vector before processing data, instead retaining the all-zero key-derived offset state established during cipher initialization. Messages encrypted under the same key consequently reuse the same effective nonce regardless of their supplied IVs. If EVP_EncryptFinal_ex() subsequently generates the authentication tag, deferred IV initialization clears the accumulated plaintext checksum, making the tag depend only on the key and IV rather than the message. This permits confidentiality loss and, under the affected tag-generation sequence, universal ciphertext forgery. Applications using the documented streaming cipher API, OpenSSL SSL/TLS, and the identified OpenSSL FIPS modules are not affected.
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OpenSSL's AES-OCB one-shot EVP_Cipher() path ignores the supplied IV, causing effective nonce reuse and loss of confidentiality. If EVP_EncryptFinal_ex() subsequently generates the tag, the tag can become independent of message content, permitting arbitrary ciphertext forgery from a captured message. The documented streaming API avoids the flaw; OpenSSL TLS and FIPS modules are unaffected.
OpenSSL's AES-OCB one-shot EVP_Cipher() path ignores the supplied IV, causing effective nonce reuse and loss of confidentiality. Subsequent tag generation can discard the accumulated plaintext checksum, enabling universal ciphertext forgery from a captured message. OpenSSL TLS and applications using the documented streaming AEAD interface are unaffected. Using EVP_CipherUpdate() and EVP_CipherFinal_ex() avoids the vulnerable path.
A vulnerability addressed by the referenced Alma Linux 9.2 security update; no technical flaw details are provided.
An OpenSSL AES-OCB flaw in which the IV is ignored on the EVP_Cipher() processing path.
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Cross-references every affected SKU, including bundled OEM variants.
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