CVE-2026-41479: Authlib is a Python library which builds OAuth and OpenID Connect servers

Q: How do I fix CVE-2026-41479?

authlib: upgrade to 1.6.10. Exact commands for each OS are on this page.

Q: Is CVE-2026-41479 being exploited?

CVE-2026-41479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41479 affect?

CVE-2026-41479 affects authlib. Severity is medium (CVSS 5.4). 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

Q: How urgent is CVE-2026-41479?

Priority 28/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2026-41479 is a medium-severity flaw (CVSS 5.4) affecting authlib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 registr

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-06-22
Last modified	2026-06-26

Publisher (CNA): GitHub, Inc. · Vendor: authlib

Last updated 2026-06-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 21:16 UTCPublished CVE record published
2026-06-26 20:10 UTCUpdated Record last modified

authlib authlib UPGRADE

Affected: < 1.6.10 · 1.7.0

Fixed in: 1.6.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy authlib || rpm -q authlib || authlib --version

2. UPGRADE to 1.6.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade authlib

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade authlib

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41479?

authlib: upgrade to 1.6.10. Exact commands for each OS are on this page.

Is CVE-2026-41479 being exploited?

CVE-2026-41479 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41479 affect?

CVE-2026-41479 affects authlib. Severity is medium (CVSS 5.4). 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

How urgent is CVE-2026-41479?

Priority 28/100. Public exploit reference

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-44681 MEDIUM 6.1 UPGRADE Authlib is a Python library which builds OAuth and OpenID Connect servers

References

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