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CVE-2022-39227: Python-jwt subject to Authentication Bypass by Spoofing

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-09-23 · updated 2026-06-17
• Weakness: CWE-290

Description

python-jwt is a module for generating and verifying JSON Web Tokens. Versions prior to 3.3.4 are subject to Authentication Bypass by Spoofing, resulting in identity spoofing, session hijacking or authentication bypass. An attacker who obtains a JWT can arbitrarily forge its contents without knowing the secret key. Depending on the application, this may for example enable the attacker to spoof other user's identities, hijack their sessions, or bypass authentication. Users should upgrade to version 3.3.4. There are no known workarounds.

Affected products

• davedoesdev python-jwt: from 3.0.0 before 3.3.4 — fixed in 3.3.4

How to fix

Upgrade to a fixed version: davedoesdev python-jwt 3.3.4. Check the vendor advisory for mitigations.

References

• https://github.com/davedoesdev/python-jwt/commit/88ad9e67c53aa5f7c43ec4aa52ed34b7930068c9
• https://github.com/davedoesdev/python-jwt/security/advisories/GHSA-5p8v-58qm-c7fp
• https://github.com/pypa/advisory-database/blob/main/vulns/python-jwt/PYSEC-2022-259.yaml
• https://www.vicarius.io/vsociety/posts/authentication-bypass-in-python-jwt
• https://github.com/davedoesdev/python-jwt/commit/88ad9e67c53aa5f7c43ec4aa52ed34b7930068c9
• https://github.com/davedoesdev/python-jwt/security/advisories/GHSA-5p8v-58qm-c7fp
• https://github.com/pypa/advisory-database/blob/main/vulns/python-jwt/PYSEC-2022-259.yaml
• https://www.vicarius.io/vsociety/posts/authentication-bypass-in-python-jwt

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