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Public proof of conceptFix available

CVE-2022-39227

A public proof of concept exists; no exploitation attested.

  • Published2022-09-23
  • Fixed in3.3.4
  • WeaknessCWE-290

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-09-2307:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-39227?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-39227?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Python-jwt project python-jwt
BranchAffectedFixed in
3.x≥ 3.0.0, < 3.3.43.3.4
3.3< 3.3.43.3.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Python-jwt project python-jwt to 3.3.4

Advisories and patches

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifieduser0x1337/CVE-2022-39227NoSpaceAvailable/CVE-2022-39227melikesraoz/cve-2022-39227-jwt-auth-bypass-demo
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2024-07-10
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.19.1read 2026-10-23
  • NVDCVSS 3.19.1read 2026-10-23
  • CNAweakness (CWE)CWE-290read 2026-10-23
  • FIRST EPSSEPSS score5.3 %2026-10-23
  • PoC-in-GitHubproof of concept3read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2022-09-23
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2022-39227?

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.

Is CVE-2022-39227 actively exploited?

Active exploitation of CVE-2022-39227 has not been confirmed. Its EPSS score was 5.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-39227?

CVE-2022-39227 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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