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CVE-2026-9076 is a low-severity heap out-of-bounds read in OpenSSL's CMS password-based decryption path for RFC 3211 PWRI key unwrapping. When attacker-supplied CMS data is processed, the key-encryption algorithm identifier can select a stream-mode KEK cipher even though the unwrap logic in kek_unwrap_key() assumes block-cipher semantics for the RFC check-byte validation. The function allocates a heap buffer based on the wrapped key length from the message and then performs a 7-byte check-byte test. The existing minimum-length guard is derived from the wrapping cipher block length, but because the attacker controls the cipher selection through the PWRI keyEncryptionAlgorithm OID and a stream-mode cipher may not provide the expected block-size constraints, the allocated buffer can be too small for the subsequent check-byte read. This results in a small heap buffer over-read during the unwrap attempt, before any password authentication succeeds. The issue affects applications that call CMS_decrypt() or CMS_decrypt_set1_password() on untrusted CMS input, including equivalent command-line usage of OpenSSL CMS password-based decryption. OpenSSL FIPS modules are not affected.
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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.
A low-severity OpenSSL heap out-of-bounds read in CMS password-based decryption where attacker-controlled cipher selection can bypass length assumptions during PWRI key unwrap, potentially causing denial of service.
A security vulnerability in OpenSSL fixed by updating OpenSSL to version 3.5.7; no further details are provided in the content.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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