Nezha 2.0.10 through 2.3.2 SSRF Denylist Bypass IPv6
Nezha versions 2.0.10 through 2.3.2 use a restricted HTTP client to validate user-configurable notification and DDNS webhook URLs, but the denylist did not cover IPv6 transition ranges — specifically the 6to4 prefix 2002::/16 and the local-use IPv4/IPv6 translation prefix 64:ff9b:1::/48. Because such addresses satisfy Go's netip.Addr.IsGlobalUnicast check, the URL validator accepted them. An authenticated user able to configure a webhook may be able to cause the dashboard to issue requests to an otherwise restricted IPv6 endpoint, but only where the dashboard's network provides unusual or non-standards-compliant routing for these transition ranges; no direct path to an IPv4 metadata, loopback, or private-network HTTP request has been demonstrated. The issue is fixed in version 2.3.3 (commit d1fcde8e), which blocks both prefixes.
CVE-2026-101087
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-101087
nezha
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "nezhahq",
"product": "nezha",
"versions": [
{
"status": "affected",
"version": "2.0.10",
"lessThan": "2.3.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "2.3.3",
"versionType": "semver"
}
],
"packageURL": "pkg:golang/github.com/nezhahq/nezha",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-101087
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #4391 · Revision 1
- Added to Heist Feed
- Publisher date