Nezha Monitoring: Private services (`EnableShowInService: false`) are enumerable via per-server endpoints, leaking name and timing data

published 2026-06-10 4 mo ago modified 2026-10-25 14 d ago also GHSA-vrmh-5mmx-hjwx , GO-2026-5672 , EUVD-2026-36597

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 distros 1

go github.com/nezhahq/nezha 2.0.14

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 4 mo ago (2026-06-15)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/nezhahq/nezha/security/advisories/GHSA-vrmh-5mmx-hjwx referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/nezhahq/nezha	>=2.0.0, <2.0.14 all versions	2.0.14

Affected products

nezhahq nezha

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-285 Improper Authorization
CWE-863 Incorrect Authorization

References

github.com /nezhahq/nezha/security/advisories/GHSA-vrmh-5mmx-hjwx
exploit, web, advisory
nvd.nist.gov /vuln/detail/CVE-2026-49397
advisory
github.com /nezhahq/nezha
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary