Loading vulnerability…
A flaw in OpenSSL's AES-OCB implementation causes the application-supplied initialization vector to be silently ignored when the cipher is driven through the public one-shot EVP_Cipher() API instead of the documented streaming interface. In the vulnerable code path, the OCB provider fails to flush the caller-supplied IV into the OCB context before processing data, so encryption proceeds with the all-zero key-derived offset state left by cipher initialization. As a result, every encryption performed under the same key uses the same effective nonce regardless of the IV provided by the caller. If authentication tags are then obtained through the affected flow, deferred IV setup can clear the running checksum that should reflect the plaintext, causing the resulting tag to depend only on the key and IV rather than on the plaintext or ciphertext. The issue affects applications that combine AES-OCB with EVP_Cipher() on vulnerable OpenSSL branches. Applications using the documented EVP_CipherUpdate() and EVP_CipherFinal_ex() streaming API are not affected, and OpenSSL's SSL/TLS implementation is not affected because AES-OCB is not used as a TLS cipher suite there.
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.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
26 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability addressed in Alpine Linux 3.22.5 and 3.23.5 as part of the June 9, 2026 OpenSSL advisory.
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.
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.