CVE-2026-79671: medium-severity vulnerability in lin-snow Ech0
Ech0 before 4.4.3 SSRF via DNS Resolution Bypass
Published · Updated
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.1epss 0.3%
exploitation probability
0.3%top 76% of all CVEs
observed exploitation
nono source reports it
Ech0 before 4.4.3 contains a server-side request forgery vulnerability in the validateWebhookURL function (webhook_setting_service.go), which only validates literal IP addresses via net.ParseIP() and fails to reject hostnames that DNS-resolve to private or internal IPs (e.g., 169.254.169.254.nip.io). An attacker with admin privileges can create a webhook with such a hostname to bypass validation and cause the server to make requests to internal services, cloud metadata endpoints, and private network resources. The issue is fixed in 4.4.3.
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Affected products
lin-snow · Ech0Related CVEs — lin-snow Ech0
In the same product, most dangerous first.
CVE-2026-35037HIGHEch0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadataEPSS 0.6%CVE-2026-79665HIGHEch0 before 4.5.1 Authorization Bypass via Session TokensEPSS 0.5%CVE-2026-79658HIGHEch0 before 5.0.1 Denial of Service via Accept-LanguageEPSS 0.5%CVE-2026-33638MEDIUMEch0 authenticated user-list exposed data via public `/api/allusers` endpointEPSS 0.5%CVE-2026-79668MEDIUMEch0 before 4.7.3 Unauthenticated Like Endpoint Metric InflationEPSS 0.4%CVE-2026-79661MEDIUMEch0 before 4.7.3 Unauthenticated fav_count ModificationEPSS 0.4%