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CVE-2026-62355— TDengine: Standard User permission unexpect

Quick assessment

Affected
taosdata TDengine
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TDengine是中国TDengine公司开源的一款开源、高性能、云原生时间序列数据库。 TDengine 3.4.1.15之前版本存在权限许可和访问控制问题漏洞，该漏洞源于权限管理问题，可能导致Data Reader admin_user执行create udf操作，而标准用户本应对非数据库对象拥有只读权限。

CVSS 5.4 · Medium EPSS 0.23% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
taosdata TDengine < 3.4.1.15 affected
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I. Basic Information for CVE-2026-62355

Vulnerability Information
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Vulnerability Title
TDengine: Standard User permission unexpect
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
TDengine 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TDengine是中国TDengine公司开源的一款开源、高性能、云原生时间序列数据库。 TDengine 3.4.1.15之前版本存在权限许可和访问控制问题漏洞，该漏洞源于权限管理问题，可能导致Data Reader admin_user执行create udf操作，而标准用户本应对非数据库对象拥有只读权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
taosdata TDengine < 3.4.1.15 -

II. Public POCs for CVE-2026-62355

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III. Intelligence Information for CVE-2026-62355

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Vendor Advisories for CVE-2026-62355 (1)

Same Patch Batch · taosdata · 2026-07-15 · 6 CVEs total

CVE-2026-62349 8.3 HIGH TDengine: Off-by-One Buffer Overflow
CVE-2026-62351 7.5 HIGH TDengine: Unauthenticated Remote Denial of Service via Out-of-Bounds Read in transDecompre
CVE-2026-62350 7.2 HIGH TDengine: UDF lead to RCE
CVE-2026-62348 5.4 MEDIUM TDengine: KILL SSMIGRATE missing authorization lets low-privilege users interrupt shared-s
CVE-2026-62353 5.4 MEDIUM TDengine: Authenticated Out-of-Bounds Read in SQL Lexer tGetToken

IV. Related Vulnerabilities

Same product: TDengine
Same vendor: taosdata
Same weakness: CWE-269

V. Comments for CVE-2026-62355

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