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CVE-2026-45446 is an authentication flaw in OpenSSL's AES-SIV and AES-GCM-SIV provider implementations affecting messages with empty ciphertext and Additional Authenticated Data (AAD). The expected authentication tag is computed only when decryption processes non-empty ciphertext. If an application supplies AAD and calls EVP_DecryptFinal_ex() without performing a ciphertext update, the expected tag is not recalculated and can retain its all-zero value. AES-GCM-SIV consequently accepts arbitrary AAD with empty ciphertext and an all-zero tag under an unknown key. Exploitation with AES-SIV additionally requires reuse of the decryption context without resetting the key. AES-SIV was introduced in OpenSSL 3.0 and AES-GCM-SIV in OpenSSL 3.2; these introduction versions do not establish fixed-version boundaries. OpenSSL's native TLS, CMS, PKCS7, HPKE, and QUIC implementations do not use these modes and are unaffected. The affected code is outside the OpenSSL FIPS module boundary.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
58 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A moderate-severity vulnerability addressed by an AlmaLinux 9.2 security update. The listed CVSS v3 vector indicates network reachability, high attack complexity, no privileges or user interaction required, and limited confidentiality and integrity impact.
An unspecified vulnerability addressed by the EulerOS_SA-2026-3787 OpenSSL package advisory.
An OpenSSL-related vulnerability addressed by the EulerOS_SA-2026-3812 security advisory.
An OpenSSL vulnerability referenced by the NewStart CGSL advisory; no technical details are provided.
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.