# CVE-2026-102275: PyJWT OKP algorithm key validation bypass

Source: https://junglewise.ai/threats/cve-2026-102275-pyjwt-is-a-python-implementation-of-json-web-token-standards  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-102275 · Severity: medium · CVSS 6.5 · Published 2026-09-28

PyJWT is a Python library for creating and validating JSON Web Tokens (JWTs), commonly used for authentication in web applications. A vulnerability in versions 2.1.0 through 2.15.0 allows an attacker to use a stolen token without the legitimate private key by exploiting inconsistent key components in OKP (Octet string key pairs). An attacker could forge or manipulate sender-constrained tokens to impersonate another user or gain unauthorized access to protected resources.

Technologies: [PyJWT](https://junglewise.ai/threats/technologies/pyjwt-pyjwt), [pyjwt (PyPI)](https://junglewise.ai/threats/technologies/pypi-pyjwt). Vendors: [PyJWT](https://junglewise.ai/threats/vendors/pyjwt), [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-102275 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102275 being exploited in the wild.

**How severe is CVE-2026-102275?** Medium severity, with a CVSS score of 6.5, published 28 September 2026.

**Which products and versions are affected?** PyJWT 2.1.0 to 2.14.1; pyjwt (PyPI) >= 2.1.0, <= 2.14.0, ECOSYSTEM:introduced=2.1.0,fixed=2.15.0.

**Is there a fix for CVE-2026-102275?** Yes. pyjwt (PyPI): upgrade to 2.15.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-102275 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-102275?** Check whether you run PyJWT or pyjwt (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- pyjwt (PyPI): upgrade to 2.15.0 or later

  ```sh
  pip install "pyjwt>=2.15.0"
  ```


## Technical details

The OKPAlgorithm.from_jwk() method in jwt/algorithms.py fails to validate that the public key derived from the private key component (d) matches the supplied public key component (x) in OKP private JWKs. An attacker can supply a JWK with mismatched x and d values, causing identity verification to use x while cryptographic operations use d, creating a key confusion vulnerability. This is fixed in version 2.15.0.

## Affected products

- PyJWT PyJWT 2.1.0 to 2.14.1

## Identifiers

- CVE-2026-102275
- GHSA-x33g-cr3x-6449
- PYSEC-2026-4183

## Timeline

- 2026-09-28: disclosed
- 2026-09-23: patched: Version 2.15.0 released

## References

- [https://github.com/jpadilla/pyjwt/commit/3cd9ceec33ced359decbad75b413ad668ae6332c](https://github.com/jpadilla/pyjwt/commit/3cd9ceec33ced359decbad75b413ad668ae6332c)
- [https://github.com/jpadilla/pyjwt/releases/tag/2.15.0](https://github.com/jpadilla/pyjwt/releases/tag/2.15.0)

## Related threats

- [PyJWT HS256/384/512 token forgery via empty HMAC key in oct JWK](https://junglewise.ai/threats/pyjwt-hs256-384-512-verify-accepts-empty-hmac-key-via-oct-jwk-pyjwk-a3ba63d2)
- [PyJWT decode() options-dict mutation enabling claim-verification bypass](https://junglewise.ai/threats/cve-2026-103001-pyjwt-decode-reintroduces-options-dict-mutation-enabling-silent)
- [PyJWT unhandled ValueError in JWK Set parsing](https://junglewise.ai/threats/cve-2026-102274-pyjwt-is-a-python-implementation-of-json-web-token-standards)
- [PyJWT HMAC key validation bypass in HMACAlgorithm.prepare_key](https://junglewise.ai/threats/cve-2026-102273-pyjwt-is-a-python-implementation-of-json-web-token-standards)
- [PyJWT HMAC key confusion via BOM-prefixed public JWK](https://junglewise.ai/threats/cve-2026-102272-pyjwt-is-a-python-implementation-of-json-web-token-standards)