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CVE PROGRAM SOURCE RECORD7.1 High

CVE-2026-84971

Persistent client crash loop via undersized FLE2 insert-update ciphertext in decryption path

Description

Improper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a failed internal check that terminates the process using the library. A party able to place a suitably formed encrypted value where an application will decrypt it, or able to control the responses the application receives, may cause that application to stop running.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MongoDB libmongocrypt

Default version status: unaffected

  • 1.7.0 to < 1.20.4affected

References