CVE-2026-104056
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-104056- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-345, CWE-346, CWE-829
- Updated
- 2026-11-02
EUVDEUVD-2026-91003
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.
- Record
EUVD-2026-91003- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-8wx9-759m-hfm8
Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached...
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.
- Record
GHSA-8wx9-759m-hfm8- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-345
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-104056- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-345, CWE-346, CWE-829
- Updated
- 2026-11-02
OSVDEBIAN-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.
- Record
DEBIAN-CVE-2026-104056- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-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.
- Record
UBUNTU-CVE-2026-104056- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
python-authlibDebian:12 |
All versions, plus listed versions 1.2.0-11.2.0-1+deb12u11.2.0-1+deb12u21.2.1-11.3.0-1 Show 22 moreShow less1.3.0-21.3.0-31.3.1-11.3.2-11.3.2-21.4.0-11.4.1-11.5.0-11.5.1-11.5.2-11.6.0-11.6.1-11.6.3-11.6.4-11.6.5-11.6.6-11.6.7-11.6.8-11.6.9-11.7.0-11.7.2-11.7.2-2 |
None known |
python-authlibDebian:13 |
All versions, plus listed versions 1.6.0-11.6.0-1+deb13u11.6.1-11.6.3-11.6.4-1 Show 8 moreShow less1.6.5-11.6.6-11.6.7-11.6.8-11.6.9-11.7.0-11.7.2-11.7.2-2 |
None known |
python-authlibDebian:14 |
All versions, plus listed versions 1.6.0-11.6.1-11.6.3-11.6.4-11.6.5-1 Show 7 moreShow less1.6.6-11.6.7-11.6.8-11.6.9-11.7.0-11.7.2-11.7.2-2 |
None known |
python-authlibUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 0.15.4-10.15.5-10.15.5-1ubuntu0.1~esm10.15.5-1ubuntu0.1~esm2 |
None known |
python-authlibUbuntu:Pro:24.04:LTS |
All versions, plus listed versions 1.2.1-11.3.0-11.3.0-1ubuntu0.1~esm11.3.0-1ubuntu0.1~esm2 |
None known |
python-authlibUbuntu:26.10 |
All versions, plus listed versions 1.6.7-11.7.2-11.7.2-2 |
None known |
python-authlibUbuntu:Pro:26.04:LTS |
All versions, plus listed versions 1.6.0-11.6.5-11.6.6-11.6.7-11.6.7-1ubuntu0.1~esm1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-104056 is a critical vulnerability (CVSS 9.8) in Authlib, published October 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 9th percentile. No source names a fixed version.