Description
An out-of-bounds read in SCRAM authentication response parsing in the MongoDB C Driver can read one byte beyond a fixed-size buffer when processing a malformed server-final message. A server or network intermediary able to provide this message before server-signature verification can cause the application using the driver to terminate. The extra byte is not returned through the protocol.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| MongoDB | C Driver | 1.1.0 – < 1.30.13, 2.0.0 – < 2.4.0 | 1.30.13 |
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 | mongo-c-driver | 2.4.0-1 | — |
| Debian 13 | mongo-c-driver | No fix yet | — |
| Debian 12 | mongo-c-driver | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mongo-c-driver | No fix yet | — |
| Ubuntu 26.04 LTS | mongo-c-driver | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | mongo-c-driver | No fix yet | — |
| Ubuntu Pro 22.04 LTS | mongo-c-driver | No fix yet | — |
| Ubuntu Pro 20.04 LTS | mongo-c-driver | No fix yet | — |
Advisories 1
- WID-SEC-2026-3830 MongoDB Treiber: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026