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CVE-2026-42542— TDengine has an integer underflow in uvConnMayGetUserInfo() allows unauthenticated remote crash (DoS)

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TDengine公司的一款开源、高性能、云原生时间序列数据库。 TDengine 3.4.0.0版本至3.4.1.5版本存在数字错误漏洞，该漏洞源于未经验证的远程攻击者发送单个特制RPC数据包，可能导致taosd服务器进程崩溃。

CVSS 7.5 · High EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
taosdata TDengine >= 3.4.0.0, < 3.4.1.6 affected
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I. Basic Information for CVE-2026-42542

Vulnerability Information
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Vulnerability Title
TDengine has an integer underflow in uvConnMayGetUserInfo() allows unauthenticated remote crash (DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
TDengine is an open source, time-series database optimized for Internet of Things devices. In versions 3.4.0.0 through 3.4.1.5, an unauthenticated remote attacker can crash the taosd server process by sending a single crafted RPC packet. No credentials or prior session state are required. Version 3.4.1.6 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
TDengine 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TDengine是TDengine公司的一款开源、高性能、云原生时间序列数据库。 TDengine 3.4.0.0版本至3.4.1.5版本存在数字错误漏洞，该漏洞源于未经验证的远程攻击者发送单个特制RPC数据包，可能导致taosd服务器进程崩溃。
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 >= 3.4.0.0, < 3.4.1.6 -

II. Public POCs for CVE-2026-42542

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III. Intelligence Information for CVE-2026-42542

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Vendor Advisories for CVE-2026-42542 (1)

Vendor Pages for CVE-2026-42542 (1)

IV. Related Vulnerabilities

Same product: TDengine
Same vendor: taosdata
Same weakness: CWE-191

V. Comments for CVE-2026-42542

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