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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| MongoDB | libmongocrypt | 1.7.0 – < 1.20.4 | 1.20.4 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libmongocrypt | 1.20.4-1 | — |
| Debian 13 | libmongocrypt | No fix yet | — |
| Debian 12 | libmongocrypt | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libmongocrypt | No fix yet | — |
| Ubuntu 26.04 LTS | libmongocrypt | No fix yet | — |
| Ubuntu 24.04 LTS | libmongocrypt | No fix yet | — |
| Ubuntu 22.04 LTS | libmongocrypt | No fix yet | — |
Advisories 1
- WID-SEC-2026-3182 MongoDB: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 3, 2026