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Public proof of concept

CVE-2026-104056

CVE-2026-104056

A public proof of concept exists; no exploitation attested.

  • Published2026-10-01
  • WeaknessCWE-345 · CWE-346 · CWE-829

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-10-0119:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-104056?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-104056?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-104056 Red Hat Product Security11 known affected

    authlib: authlib: Information disclosure via unvalidated discovery metadata

    exploit-intelligence/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8 · +8 more

Full record on NVD

Fix

  1. Workaround from the vendor Red Hat Product Security CVE-2026-104056 · 11 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
  2. No fix available, says the vendor Red Hat Product Security CVE-2026-104056 · 9 productsFix deferred
  3. No fix planned, says the vendor Red Hat Product Security CVE-2026-104056 · 2 productsOut of support scope

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-10-01
Last Modified
2026-10-05
NVD status
Awaiting Analysis

Frequently asked questions

What is CVE-2026-104056?

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.

Is CVE-2026-104056 actively exploited?

A proof-of-concept exploit exists for CVE-2026-104056, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-104056?

CVE-2026-104056 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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