CVE-2026-79659 json
Ech0 before 4.7.3 Server-Side Request Forgery via fetchPeerConnectInfo
published 2026-05-07 6 mo ago modified 2026-10-08 31 d ago also GHSA-8mc6-xjpr-h98x , GO-2026-5259 , EUVD-2026-65455
- cvss
- 7.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
Ech0 before 4.7.3 contains a server-side request forgery vulnerability in the fetchPeerConnectInfo function that uses unvalidated HTTP requests instead of safe request methods with URL validation. Authenticated attackers can supply arbitrary URLs to access internal services and cloud metadata endpoints by triggering connection health checks or peer connection operations.
Patch / fix
- go github.com/lin-snow/ech0 1.4.8-0.20260503040602-091d26d2d942
- lin-snow Ech0 4.7.3
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/lin-snow/Ech0/security/advisories/GHSA-8mc6-xjpr-h98x referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N |
| CNA | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
| CNA | 4.0 | 8.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/lin-snow/ech0 | <1.4.8-0.20260503040602-091d26d2d942 |
1.4.8-0.20260503040602-091d26d2d942 |
Affected products
- lin-snow Ech0
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/lin-snow/Ech0/commit/091d26d2d942df6df9f520328d2f9cf2592bbefc
web
-
github.com
/lin-snow/Ech0/security/advisories/GHSA-8mc6-xjpr-h98x
vendor-advisory, exploit, web, advisory
-
vulncheck.com
/advisories/ech0-before-server-side-request-forgery-via-fetchpeerconnectinfo
third-party-advisory
-
github.com
/lin-snow/Ech0
package
Sources
- CVE List CVE-2026-79659
- GitHub Advisory GHSA-8mc6-xjpr-h98x
- NVD CVE-2026-79659
- OSV GO-2026-5259
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