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

Q: How do I fix CVE-2026-35036?

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

Q: Is CVE-2026-35036 being exploited?

CVE-2026-35036 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-2026-35036 affect?

CVE-2026-35036 affects ech0. Severity is high (CVSS 7.5). Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, Ech0 implements link preview (editor fetches a page title) through GET /api/website/title. That is legitimate product behavior, but the imple

Q: How urgent is CVE-2026-35036?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-35036 is a high-severity flaw (CVSS 7.5) 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, Ech0 implements link preview (editor fetches a page title) through GET /api/website/title. That is legitimate product behavior, but the implementation is unsafe: the route is unauthenticated, accepts a fully attacker-controlled URL, performs a server-side GET, reads the entire response body into memory (io.ReadAll). There is no host allowlist, no SS

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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
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.

Write-up: github.com/lin-snow/Ech0/security/advisories/GHSA-wc4h-2348-jc3p

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-2026-35036?

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

Is CVE-2026-35036 being exploited?

CVE-2026-35036 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-2026-35036 affect?

CVE-2026-35036 affects ech0. Severity is high (CVSS 7.5). Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, Ech0 implements link preview (editor fetches a page title) through GET /api/website/title. That is legitimate product behavior, but the imple

How urgent is CVE-2026-35036?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-35037 HIGH 7.2 UPGRADE Ech0 is an open-source, self-hosted publishing platform for personal idea sharing

References

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