CVE-2026-79659Public exploitNetwork attack vector

Internal data access via unvalidated peer URLs

Published Aug 25, 2026 · Updated Aug 25, 2026

SSRF in fetchPeerConnectInfo in Ech0 before 4.7.3 allows remote authenticated users to access internal services via crafted peer URLs. The function appends /api/connect to a stored peer URL and calls SendRequest without the private-address and DNS-rebinding checks in SendSafeRequest. A logged-in user who can add a Connect entry can make the server read responses from internal services or cloud metadata endpoints.

CVSS severity8.3
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in fetchPeerConnectInfo in Ech0 before 4.7.3 allows remote authenticated users to access internal services via crafted peer URLs. The function appends /api/connect to a stored peer URL and calls SendRequest without the private-address and DNS-rebinding checks in SendSafeRequest. A logged-in user who can add a Connect entry can make the server read responses from internal services or cloud metadata endpoints.

The record

CVE
CVE-2026-79659
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
lin-snow
Product
Ech0
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

lin-snow · Ech0version=0 <4.7.3

Published CVSS scores

7.7VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
8.3VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Cloud Instance Metadata API

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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