---
id: CVE-2026-79664
title: >-
  Ech0 before 4.7.3 fails to properly revoke access tokens created with
  never-expire option, allowing attackers to maintain perpetual authenticated
  access after token theft
summary: >-
  Ech0 before 4.7.3 fails to properly revoke access tokens created with
  never-expire option, allowing attackers to maintain perpetual authenticated
  access after token theft. Three independent revocation mechanisms fail: logout
  panics on ni…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-613
vendor: lin-snow
product: github.com/lin-snow/ech0
affected:
  - github.com/lin-snow/ech0 < 1.4.8-0.20260503041146-eab62379c795
patched:
  - github.com/lin-snow/ech0 1.4.8-0.20260503041146-eab62379c795
published: '2026-08-25'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:14:58.577'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-79664'
references:
  - url: 'https://github.com/lin-snow/Ech0/security/advisories/GHSA-fpw6-hrg5-q5x5'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/ech0-before-access-token-revocation-bypass
    label: disclosure@vulncheck.com
  - url: 'https://github.com/lin-snow/Ech0/security/advisories/GHSA-fpw6-hrg5-q5x5'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://github.com/lin-snow/Ech0/commit/eab62379c795c3f4850a9ca938ae3f27d7171541
  - url: 'https://github.com/lin-snow/Ech0'
tags:
  - nvd
  - osv
  - go
epss: 0.00217
epssPercentile: 0.12411
aliases:
  - GHSA-fpw6-hrg5-q5x5
  - GO-2026-5375
ecosystem: go
ingestedAt: '2026-08-27T19:27:46.782Z'
---

## Overview

Ech0 before 4.7.3 fails to properly revoke access tokens created with never-expire option, allowing attackers to maintain perpetual authenticated access after token theft. Three independent revocation mechanisms fail: logout panics on nil ExpiresAt field, RevokeToken skips when remainTTL is zero, and admin delete does not blacklist the JTI, leaving stolen tokens cryptographically valid until JWT secret rotation.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-79664)

Affected packages:

- `github.com/lin-snow/ech0 < 1.4.8-0.20260503041146-eab62379c795`

Patched in:

- `github.com/lin-snow/ech0 1.4.8-0.20260503041146-eab62379c795`

Source: https://osv.dev/vulnerability/GHSA-fpw6-hrg5-q5x5