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CVE-2026-9076 is a heap out-of-bounds read in OpenSSL's kek_unwrap_key() during CMS password-based decryption using RFC 3211 PasswordRecipientInfo (PWRI) key unwrapping. The function reads seven check bytes from an allocation sized according to the message's wrapped-key length. Its minimum-length check depends on the wrapping cipher's block length, but the attacker-controlled keyEncryptionAlgorithm OID is not restricted to block ciphers. Selecting a stream-mode key-encryption-key cipher can therefore bypass the effective length guard and cause a read beyond an undersized allocation. Applications processing untrusted CMS data through CMS_decrypt() or CMS_decrypt_set1_password() are affected. The read occurs before authentication succeeds and does not require knowledge of the password. A crash is possible under particular memory-layout conditions; the over-read bytes are not disclosed. OpenSSL FIPS modules are unaffected.
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OpenSSL CMS password-based key unwrapping accepts a stream-mode cipher that defeats its block-length-based minimum-size check, allowing a small heap over-read before authentication. A crash is possible if the allocation borders unmapped memory, although the description calls this unlikely with normal allocators. No password knowledge is required, and the over-read does not disclose information. FIPS modules are unaffected.
OpenSSL CMS password-recipient processing permits a stream-mode key-encryption cipher that defeats a block-length-based minimum-size check. The resulting short allocation causes a small heap over-read before authentication, without requiring password knowledge. A crash is possible near unmapped memory, but the advisory states that the bytes are not disclosed. FIPS modules are unaffected.
A vulnerability referenced by a CentOS local security-check plugin; no technical flaw details are provided.
A vulnerability referenced by the AlmaLinux 9.2 local security-check update. The content provides no technical details, exploitation status, or severity specifically attributable to this CVE.
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