{"cve":"CVE-2026-79671","nvd":{"published":"2026-08-25T12:16:35.390","modified":"2026-08-31T20:50:15.927","status":"Deferred","description":"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_v4":{"vector":"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","score":5.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N","score":5.5},"cwes":["CWE-918"],"references":["https://github.com/lin-snow/Ech0/security/advisories/GHSA-r2x7-427f-rq69","https://www.vulncheck.com/advisories/ech0-before-ssrf-via-dns-resolution-bypass","https://github.com/lin-snow/Ech0/security/advisories/GHSA-r2x7-427f-rq69"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-79671","score":0.00313,"percentile":0.24188,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-r2x7-427f-rq69","url":"https://osv.dev/vulnerability/GHSA-r2x7-427f-rq69","summary":"Ech0 has SSRF via DNS Resolution Bypass in Webhook URL Validation","modified":"2026-08-27T03:55:35.939538877Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","ranges":["<4.4.3"],"fixed":["4.4.3"]}]},{"id":"GO-2026-5603","url":"https://osv.dev/vulnerability/GO-2026-5603","summary":"Ech0 has SSRF via DNS Resolution Bypass in Webhook URL Validation in github.com/lin-snow/ech0","modified":"2026-08-27T03:55:35.939538877Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}