CVE-2026-49397 Nezha's private services (`EnableShowInService: false`) are enumerable via per-server endpoints, leaking name and timing data
Attackers can enumerate private monitoring services and leak their names and timing data via per-server endpoints in Nezha Monitoring.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49397?
CVE-2026-49397 is a medium-severity vulnerability in nezhahq nezha, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 2.0.0 to before version 2.0.14, private services (`EnableShowInService: false`) are enumerable via per-server endpoints, leaking name and timing data. This issue has been patched in version 2.0.14.
Which versions are affected by CVE-2026-49397?
3 open source packages ship an affected version, including github.com/nezhahq/nezha.
| Package | Affected | Fixed in |
|---|---|---|
github.com/nezhahq/nezha Go | All versions | None |
github.com/nezhahq/nezha Go | From 2.0.0 | 2.0.14 |
github.com/nezhahq/nezha Go | From 2.0.0 | 2.0.14 |
How do I fix CVE-2026-49397?
Upgrade github.com/nezhahq/nezha to 2.0.14 or later.
Is CVE-2026-49397 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49397 exists.
Sources
Also known as GHSA-vrmh-5mmx-hjwx, GO-2026-5672.