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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Authlib | Authlib | 1.7.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-authlib | No fix yet | — |
| Debian 13 | python-authlib | No fix yet | — |
| Debian 12 | python-authlib | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | python-authlib | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | python-authlib | No fix yet | — |
| Ubuntu Pro 24.04 LTS | python-authlib | No fix yet | — |
| Ubuntu Pro 22.04 LTS | python-authlib | No fix yet | — |