CVE-2026-48526: CWE-287: Improper Authentication in jpadilla pyjwt
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.
AI Analysis
Technical Summary
The fence-agents packages in Red Hat Enterprise Linux 10 include scripts for remote power management of cluster devices. A security flaw in the python-pyjwt library used by these packages allows authentication bypass through forged JSON Web Tokens (CVE-2026-48526). This vulnerability compromises authentication mechanisms, potentially allowing unauthorized actions within cluster management. Red Hat has released an update for fence-agents to fix this issue as detailed in advisory RHSA-2026:25902.
Potential Impact
Successful exploitation of this vulnerability allows an attacker to bypass authentication controls by using forged JSON Web Tokens, leading to unauthorized access and control over cluster node management functions. This can compromise the confidentiality and integrity of cluster operations, potentially disrupting cluster stability and security.
Mitigation Recommendations
Red Hat has released an official security update for fence-agents in Red Hat Enterprise Linux 10 to address CVE-2026-48526. Users should apply the update as described in Red Hat advisory RHSA-2026:25902 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patch.
CVE-2026-48526: CWE-287: Improper Authentication in jpadilla pyjwt
Description
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.
CVSS v3.1
Score 7.4high
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The fence-agents packages in Red Hat Enterprise Linux 10 include scripts for remote power management of cluster devices. A security flaw in the python-pyjwt library used by these packages allows authentication bypass through forged JSON Web Tokens (CVE-2026-48526). This vulnerability compromises authentication mechanisms, potentially allowing unauthorized actions within cluster management. Red Hat has released an update for fence-agents to fix this issue as detailed in advisory RHSA-2026:25902.
Potential Impact
Successful exploitation of this vulnerability allows an attacker to bypass authentication controls by using forged JSON Web Tokens, leading to unauthorized access and control over cluster node management functions. This can compromise the confidentiality and integrity of cluster operations, potentially disrupting cluster stability and security.
Mitigation Recommendations
Red Hat has released an official security update for fence-agents in Red Hat Enterprise Linux 10 to address CVE-2026-48526. Users should apply the update as described in Red Hat advisory RHSA-2026:25902 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:25902
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a2fc0030b89be688883c30c
Added to database: 06/15/2026, 09:04:03 UTC
Last enriched: 07/30/2026, 12:10:05 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 93
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