libmongocrypt: Improper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a...
CVE-2026-84971 is fixed in libmongocrypt on 1 platform by DEBIAN-CVE-2026-84971 (version 1.20.4-1), released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libmongocrypt · Debian 14 | 1.20.4-1 | DEBIAN-CVE-2026-84971 | Sep 10, 2026 |
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