---
id: CVE-2026-104056
title: >-
  Authlib version 1.7.2 and below contains a vulnerability where discovery JSON
  metadata is cached without validation or issuer-origin binding
summary: >-
  Authlib version 1.7.2 and below contains a vulnerability where discovery JSON
  metadata is cached without validation or issuer-origin binding. This allows a
  poisoned discovery response to replace all endpoint values with
  attacker-controll…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-345
  - CWE-346
  - CWE-829
vendor: Authlib
product: Authlib
affected:
  - Authlib 1.7.2
published: '2026-10-01'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T19:17:14.327'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104056'
references:
  - url: 'https://uziii2208.github.io/post/cve-2026-104056/'
    label: cret@cert.org
  - url: 'https://uziii2208.github.io/post/cve-2026-104056/'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-104056.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-104056'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2544875'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-104056'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104056'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
  - score-dispute
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-05T18:21:10.671606Z'
epss: 0.002
epssPercentile: 0.09833
scores:
  nvd: 9.8
  vendor: 5.9
  adp: 9.8
ingestedAt: '2026-10-01T18:55:42.396Z'
---

## Overview

Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controlled values rather than endpoint URLs that share the origin of the configured server metadata URL.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Exploit Intelligence, Lightspeed Core, Migration Toolkit for Applications 8, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux command line assistant, … · no fix planned: Exploit Intelligence, Red Hat Quay 3, Lightspeed Core, Migration Toolkit for Applications 8, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-104056.json)