CVE catalog

CVE-2026-41479

Severity: Medium · CVSS 5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Published: Jun 22, 2026, 8:35:13 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.26% · Oct 25, 2026

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	python-authlib	sid	`1.7.2-2`	fixed
Debian	python-authlib	forky	`1.7.2-2`	fixed
Debian	python-authlib	trixie	`1.6.0-1+deb13u1`	vulnerable
Debian	python-authlib	bookworm	`1.2.0-1+deb12u1`	not affected
Debian	python-authlib	bookworm-security	`1.2.0-1+deb12u2`	not affected
Cpe	python-authlib	Not reported	Not reported	vulnerable
Cpe	authlib	Not reported	`1.6.10`	fixed
Cpe	authlib	Not reported	Not reported	unknown
Suse	python-Authlib	linux enterprise module for python 3 15 sp7	`1.3.1-150600.3.30.1`	fixed
Opensuse	python-Authlib	leap 16.0	`1.5.2-bp160.4.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	python-authlib	source	sid	`1.7.2-1`	not yet assigned	Not reported	Not reported
Debian	python-authlib	source	forky	`1.7.2-1`	not yet assigned	Not reported	Not reported
Debian	python-authlib	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	python-authlib	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Cpe	authlib	cpe	Not reported	`1.6.10`	Not reported	Not reported	Not reported
Suse	python-Authlib	rpm	linux enterprise module for python 3 15 sp7	`1.3.1-150600.3.30.1`	Not reported	SUSE-SU-2026:4111-1	Not reported
Opensuse	python-Authlib	rpm	leap 16.0	`1.5.2-bp160.4.1`	Not reported	OPENSUSE-SU-2026:21795-1	Not reported

Notes

[trixie] python-authlib: Minor issue

OpenFactory catalog packages

[Debian 13 (Trixie)]

[python3-authlib]Affected
Source package: [python-authlib]
Details (2)
- 1.6.0-1+deb13u1 · all · trixie
  Affected
  nvd · python-authlib · debian · 13
- 1.6.0-1+deb13u1 · all · trixie
  Affected
  nvd · python-authlib · debian · 13
[python-authlib-doc]Affected
Source package: [python-authlib]
Details (2)
- 1.6.0-1+deb13u1 · all · trixie
  Affected
  nvd · python-authlib · debian · 13
- 1.6.0-1+deb13u1 · all · trixie
  Affected
  nvd · python-authlib · debian · 13

[Debian 12 (Bookworm)]

[python3-authlib]Not affected
Source package: [python-authlib]
Details (4)
- 1.2.0-1+deb12u1 · all · bookworm
  Not affected
  nvd · python-authlib · debian · bookworm
- 1.2.0-1+deb12u1 · all · bookworm
  Not affected
  nvd · python-authlib · debian · bookworm
- 1.2.0-1+deb12u2 · all · bookworm-security
  Not affected
  nvd · python-authlib · debian · bookworm
- 1.2.0-1+deb12u2 · all · bookworm-security
  Not affected
  nvd · python-authlib · debian · bookworm
[python-authlib-doc]Not affected
Source package: [python-authlib]
Details (4)
- 1.2.0-1+deb12u1 · all · bookworm
  Not affected
  nvd · python-authlib · debian · bookworm
- 1.2.0-1+deb12u1 · all · bookworm
  Not affected
  nvd · python-authlib · debian · bookworm
- 1.2.0-1+deb12u2 · all · bookworm-security
  Not affected
  nvd · python-authlib · debian · bookworm
- 1.2.0-1+deb12u2 · all · bookworm-security
  Not affected
  nvd · python-authlib · debian · bookworm

Observed: Oct 23, 2026, 9:45:33 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]