---
title: "CVE-2026-102273: PyJWT - Authentication Bypass"
description: "PyJWT 2.13.0 to < 2.14.0 contains a broken authentication caused by improper HMAC key validation accepting public asymmetric key material as HMAC secret, letting attackers forge tokens with arbitrary claims, exploit requires use of public JWK container as raw key."
url: https://panop.io/threat-heartbeat/CVE-2026-102273/
---

# CVE-2026-102273 PyJWT - Authentication Bypass

PyJWT 2.13.0 to < 2.14.0 contains a broken authentication caused by improper HMAC key validation accepting public asymmetric key material as HMAC secret, letting attackers forge tokens with arbitrary claims, exploit requires use of public JWK container as raw key.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102273)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

28 September 2026

Updated

15 October 2026

Weakness

[CWE-347](https://cwe.mitre.org/data/definitions/347.html)

## Vendor fix

Update to version 2.14.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-102273](https://nvd.nist.gov/vuln/detail/CVE-2026-102273)
- [https://github.com/jpadilla/pyjwt/commit/801cd128528c62d9b23fcd161d1a2e1c17982f95](https://github.com/jpadilla/pyjwt/commit/801cd128528c62d9b23fcd161d1a2e1c17982f95)
- [https://github.com/jpadilla/pyjwt/releases/tag/2.14.0](https://github.com/jpadilla/pyjwt/releases/tag/2.14.0)
- [https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w2cx-738m-mc7w](https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w2cx-738m-mc7w)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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