CVE-2026-35037: Ech0 is an open-source, self-hosted publishing platform for personal idea sharing

Q: How do I fix CVE-2026-35037?

ech0: upgrade to 4.2.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-35037 being exploited?

CVE-2026-35037 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35037 affect?

CVE-2026-35037 affects ech0. Severity is high (CVSS 7.2). Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, the GET /api/website/title endpoint accepts an arbitrary URL via the website_url query parameter and makes a server-side HTTP request to it w

Q: How urgent is CVE-2026-35037?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.2REMOTEUPGRADE

CVE-2026-35037 is a high-severity flaw (CVSS 7.2) affecting ech0. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, the GET /api/website/title endpoint accepts an arbitrary URL via the website_url query parameter and makes a server-side HTTP request to it without any validation of the target host or IP address. The endpoint requires no authentication. An attacker can use this to reach internal network services, cloud metadata endpoints (169.254.169.254), and loca

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-06
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: ech0

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-06 17:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

ech0 ech0 UPGRADE

Affected: < 4.2.8

Fixed in: 4.2.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ech0 || rpm -q ech0 || ech0 --version

2. UPGRADE to 4.2.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ech0

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ech0

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Go · github.com/lin-snow/ech0 · FIXED · 1.4.8-0.20260401031029-4ca56fea5ba4 · vulnerable: < 1.4.8-0.20260401031029-4ca56fea5ba4 · source

go get github.com/lin-snow/ech0@v1.4.8-0.20260401031029-4ca56fea5ba4 go list -m github.com/lin-snow/ech0

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: fineman999/POC_CVE-2026-35037 (0 stars)
Write-up: github.com/lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wc
Nuclei scan template: Ech0 < 4.2.8 - Server-Side Request Forgery

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35037?

ech0: upgrade to 4.2.8. Exact commands for each OS are on this page.

Is CVE-2026-35037 being exploited?

CVE-2026-35037 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35037 affect?

CVE-2026-35037 affects ech0. Severity is high (CVSS 7.2). Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, the GET /api/website/title endpoint accepts an arbitrary URL via the website_url query parameter and makes a server-side HTTP request to it w

How urgent is CVE-2026-35037?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-35036 HIGH 7.5 UPGRADE Ech0 is an open-source, self-hosted publishing platform for personal idea sharing

References

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