Description
An incorrect calculation in Decimal128 string parsing in the MongoDB C Driver can accept certain over-precision inputs containing leading zeros instead of rejecting them. This produces a value different from the supplied text. An actor who can provide a decimal string to an embedding application, including through Extended JSON parsing, can cause the application to store or use an incorrect numeric value.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| MongoDB | C Driver | 1.4.0 – < 1.30.13, 2.0.0 – < 2.5.6 | 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 | 2.5.6-1 | — |
| 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