What is CVE-2026-84971?

CVE-2026-84971 is a medium-severity vulnerability, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-09-03.

How severe is CVE-2026-84971?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CVE-2026-84971

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 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 v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

cna@mongodb.com

Frequently asked questions

What is CVE-2026-84971?: CVE-2026-84971 is a medium-severity vulnerability, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-09-03.
How severe is CVE-2026-84971?: Medium severity. CVSS v3 base score is 6.5 out of 10.