jpadilla pyjwt up to 2.12.x JSON Web Token improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in jpadilla pyjwt up to 2.12.x. It has been declared as critical. Impacted is an unknown function of the component JSON Web Token Handler. Executing a manipulation can lead to improper authentication. This vulnerability appears as CVE-2026-48526. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in jpadilla pyjwt up to 2.12.x. This vulnerability affects some unknown processing of the component JSON Web Token Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-48526 since 05/21/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 321094 (RHEL 10 : fence-agents (RHSA-2026:25902)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.13.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (321094) and CERT Bund (WID-SEC-2026-1923). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Red Hat Ansible Automation Platform

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.4
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321094
Nessus Name: RHEL 10 : fence-agents (RHSA-2026:25902)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: pyjwt 2.13.0

Timelineinfo

05/21/2026 CVE reserved
05/28/2026 +7 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
06/16/2026 +18 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-xgmm-8j9v-c9wx
Status: Confirmed

CVE: CVE-2026-48526 (🔒)
GCVE (CVE): GCVE-0-2026-48526
GCVE (VulDB): GCVE-100-366778
CERT Bund: WID-SEC-2026-1923 - Red Hat Ansible Automation Platform: Mehrere Schwachstellen

Entryinfo

Created: 05/28/2026 18:45
Updated: 06/16/2026 00:17
Changes: 05/28/2026 18:45 (32), 05/28/2026 18:46 (33), 06/15/2026 13:50 (7), 06/16/2026 00:17 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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