CVE-2022-36087: OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+

This month

MEDIUM 5.7UPGRADEMITIGATE

CVE-2022-36087 is a medium-severity flaw (CVSS 5.7) affecting oauthlib, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. In OAuthLib versions 3.1.1 until 3.2.1, an attacker providing malicious redirect uri can cause denial of service. An attacker can also leverage usage of `uri_validate` functions depending where it is used. OAuthLib applications using OAuth2.0 provider support or use directly `uri_validate` are affected by this issue. Version 3.2.1 contains a patch. There are no know

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-20, CWE-601
Published	2022-09-09
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fedoraproject · oauthlib project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-09-09 21:15 UTCPublished CVE record published
2026-06-17 04:52 UTCUpdated Record last modified

oauthlib project oauthlib UPGRADE

Affected: >= 3.1.1 and < 3.2.1

Fixed in: 3.2.1

Safe to downgrade to: a release before 3.1.1

1. Check installed version

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

2. UPGRADE to 3.2.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade oauthlib

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.1.1 (Debian / Ubuntu)

apt-cache madison oauthlib sudo apt install oauthlib=<VERSION_BEFORE_3.1.1> sudo apt-mark hold oauthlib

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oauthlib sudo dnf downgrade oauthlib-<VERSION_BEFORE_3.1.1> sudo dnf versionlock add oauthlib

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

fedoraproject fedora MITIGATE

Affected: 37

Fixed in: no fixed release known

Safe to downgrade to: a release before 37

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2022-36087?

oauthlib: upgrade to 3.2.1; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-36087 being exploited?

CVE-2022-36087 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-2022-36087 affect?

CVE-2022-36087 affects oauthlib, fedora. Severity is medium (CVSS 5.7). OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. In OAuthLib versions 3.1.1 until 3.2.1, an attacker providing malicious redirect uri can cause denial of service. An attacker can also leverage usage of `uri_

How urgent is CVE-2022-36087?

Priority 44/100. Public exploit reference

Software pages

Python vulnerabilities

References

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