OpenSSL AES-OCB IV Ignored on EVP_Cipher() Path
CVE-2026-45445 is a flaw in OpenSSL's AES-OCB implementation when driven through the public one-shot EVP_Cipher() API. In affected versions, the application-supplied IV is silently discarded on the EVP_Cipher() path because the OCB provider's one-shot handler fails to flush the caller-provided IV into the OCB context before processing data. As a result, each encryption operation runs with the all-zero key-derived offset state left by cipher initialization rather than the supplied nonce. This causes every message encrypted under the same key to use the same effective nonce. Additionally, if EVP_EncryptFinal_ex() is then used to obtain the authentication tag, deferred IV setup occurs at finalization time and clears the running checksum that should reflect the plaintext, causing the resulting tag to depend only on the key and IV rather than the plaintext or ciphertext. The issue affects OpenSSL 4.0.0 before 4.0.1, 3.6.0 before 3.6.3, 3.5.0 before 3.5.7, 3.4.0 before 3.4.6, and 3.0.0 before 3.0.21. OpenSSL SSL/TLS is not affected, and applications using the documented streaming interface EVP_CipherUpdate()/EVP_CipherFinal_ex() are not vulnerable.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability addressed in Alpine Linux 3.24.1 as part of the June 9, 2026 advisory.
An OpenSSL AES-OCB one-shot interface flaw that ignores the supplied IV, causing nonce reuse and resulting in severe confidentiality loss and possible authentication tag forgery.
A moderate OpenSSL AES-OCB flaw in the EVP_Cipher() one-shot path where the supplied IV is ignored, causing nonce reuse, loss of confidentiality, and possible universal forgery.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.