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MEDIUM · 6.5

CVE-2026-84971

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 t...

Vulnerability 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.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
MongodbLibmongocrypt>= 1.7.0, < 1.20.4

Related Weaknesses (CWE)

CWE-617

References

FAQ

What is CVE-2026-84971?

CVE-2026-84971 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 t...

How severe is CVE-2026-84971?

CVE-2026-84971 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-84971?

Check the references section above for vendor advisories and patch information. Affected products include: Mongodb Libmongocrypt.