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.
CVE-2026-79671
MEDIUMPre-NVD 5.55.5—Trending — 4 sources updated this weekElevated
EchelonGraph scoreHIGH confidence
Score 5.5 from GitHub Security Advisory published 2026-08-25. a secondary CVSS source baseline 5.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.5
- EG Score
- 5.5(high)
- EG Risk
- 41(Track)EG Risk 41/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity55% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 16%
- KEV
- Not listed
Published
August 25, 2026
Last Modified
August 29, 2026
Advisory Details (2)
Auto-updated Aug 25, 2026🔬 Proof of concept available. Patch available. Sources: github.
generic
Ech0 before 4.4.3 SSRF via DNS Resolution Bypass | Advisories | VulnCheck
https://www.vulncheck.com/advisories/ech0-before-ssrf-via-dns-resolution-bypassgithub Patch Available🟡 PoC Available
SSRF via DNS Resolution Bypass in Webhook URL Validation · Advisory · lin-snow/Ech0 · GitHub
https://github.com/lin-snow/Ech0/security/advisories/GHSA-r2x7-427f-rq69Vendor Advisories for CVE-2026-79671(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Go(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| github.com/lin-snow/ech0 | — | 4.4.3 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 20× in last 7d / 20× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 12:20 UTCEG score recompute
- 2026-08-29 12:20 UTCGHSA enrichment
- 2026-08-29 12:00 UTCEG score recompute
- 2026-08-29 11:59 UTCGHSA enrichment
- 2026-08-28 21:42 UTCEPSS rescore
- 2026-08-28 16:10 UTCGHSA enrichment
- 2026-08-27 17:36 UTCEG score recompute
- 2026-08-27 17:36 UTCGHSA enrichment
- 2026-08-27 17:14 UTCEG score recompute
- 2026-08-27 17:14 UTCGHSA enrichment
- 2026-08-27 14:25 UTCEPSS rescore
- 2026-08-27 09:01 UTCEG score recompute
- 2026-08-27 09:01 UTCGHSA enrichment
- 2026-08-26 14:47 UTCEPSS rescore
- 2026-08-26 10:39 UTCEG score recompute
- 2026-08-26 10:39 UTCGHSA enrichment
- 2026-08-25 12:17 UTCEG score recompute
- 2026-08-25 11:42 UTCEG score recompute
- 2026-08-25 11:41 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-79671?
CVE-2026-79671 is a medium vulnerability published on August 25, 2026. Ech0 before 4.4.3 contains a server-side request forgery vulnerability in the validateWebhookURL function (webhooksettingservice.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).…
When was CVE-2026-79671 disclosed?
CVE-2026-79671 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79671 actively exploited?
CVE-2026-79671 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.5% of all scored CVEs.
What is the CVSS score of CVE-2026-79671?
CVE-2026-79671 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-79671?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79671, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-79671
Is Your Infrastructure Affected by CVE-2026-79671?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.