CVE-2026-62355

Deferred Deferred - Pending Action

Data Reader Admin Privilege Escalation in TDengine

Publication date: 2026-07-15

Last updated on: 2026-07-15

Assigner: GitHub, Inc.

Description

TDengine is an open source, time-series database optimized for Internet of Things devices. Prior to 3.4.1.15, a Data Reader admin_user on a TDengine Cloud DB instance could run create udf even though standard users should have read-only permissions for non-database objects and show dnodes and create user were denied. This issue is fixed in version 3.4.1.15.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-15

Last Modified

2026-07-15

Generated

2026-08-05

AI Q&A

2026-07-16

EPSS Evaluated

2026-08-03

NVD

CVE-2026-62355

EUVD

EUVD-2026-44764

Affected Vendors & Products

Vendor	Product	Version / Range
taosdata	tdengine	3.4.1.15

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-269	The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

Executive Summary

This vulnerability in TDengine allows standard users with read-only permissions to create user-defined functions (UDFs) despite restrictions. It occurs due to improper privilege management in cloud database instances running the Enterprise edition when admin_user is misconfigured as a standard user. This Broken Access Control issue enables unauthorized actions.

Detection Guidance

Check TDengine version with 'taos -v' or 'curl -s http://localhost:6041/rest/sql -d "show version"'. Verify user permissions with 'curl -s http://localhost:6041/rest/sql -d "select * from information_schema.mgmt_users"' to ensure standard users lack UDF creation rights.

Impact Analysis

An attacker with standard user access could escalate privileges to create or modify UDFs, potentially leading to unauthorized data access, manipulation, or further attacks like Denial of Service if combined with other vulnerabilities.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized data access or modification, potentially breaching GDPR's data integrity principles or HIPAA's access control mandates. Organizations using TDengine Cloud must address this to maintain regulatory compliance.

Mitigation Strategies

Upgrade TDengine to version 3.4.1.15 or later. Review and correct admin_user configurations to ensure proper privilege separation. Restrict UDF creation to authorized admin accounts only.

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