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CVE-2026-33117 is a critical integrity-bypass vulnerability in the Azure SDK for Java Key Vault Keys library affecting versions prior to 4.10.6. The flaw exists in the local cryptographic verification path used for AES-CBC-HMAC-SHA2 authenticated decryption, specifically in the AesCbcHmacSha2 decryption logic. Due to a variable shadowing error in the decryption routine, the implementation compared the computed authentication tag against itself rather than comparing the received tag to the computed value. As a result, the constant-time comparison always succeeded, causing tampered ciphertext to be accepted as authentic. The issue affects applications using the vulnerable local decryption path for algorithms in the AES-CBC-HMAC-SHA2 family, including A128CBC-HS256, A192CBC-HS384, and A256CBC-HS512. Operations delegated to the Azure Key Vault service are not affected.
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An improper authentication vulnerability in Azure SDK that allows unauthorized security feature bypass over a network.
A critical improper authentication / cryptographic verification flaw in the Azure SDK for Java Key Vault cryptography implementation where a variable shadowing bug causes the decryption routine to compare a computed HMAC authentication tag with itself, allowing tampered ciphertext to pass integrity checks.
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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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