AIKIDO-2026-892880
mongodb.libmongocrypt is vulnerable to Denial of Service (DoS)
71
High Risk
This Affects:
mongodb.libmongocryptTL;DR
libmongocrypt computes the plaintext length for an FLE2 indexed encrypted value directly from the ciphertext length in mc_FLE2IndexedEncryptedValue_decrypt and resizes the output buffer without checking the returned status. When a value carries a ciphertext smaller than the algorithm minimum, get_plaintext_len reports an error but the zero length is treated as valid, tripping an internal assertion that terminates the process. A value placed where the application decrypts it, or a manipulated server response, repeatedly crashes the client. The fix rejects undersized ciphertext and checks mongocrypt_status_ok before resizing the plaintext buffer.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application decrypts client-side field-level encrypted values whose ciphertext can be influenced by untrusted input.
Background info
mongodb.libmongocrypt is vulnerable to Denial of Service (DoS) in versions 1.7.0 - 1.20.3.
How to fix this
Upgrade the mongodb.libmongocrypt library to the patch version.
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