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CVE-2026-62349— TDengine: Off-by-One Buffer Overflow

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 3.4.1.14之前版本存在缓冲区错误漏洞，该漏洞源于parUtil.c trimString()函数在处理SQL字符串转义序列时仅检查一个字节的空间，导致堆栈缓冲区tmpTokenBuf出现单字节越界写入，可能造成拒绝服务和远程代码执行。

CVSS 8.3 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
taosdata TDengine < 3.4.1.14 affected
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I. Basic Information for CVE-2026-62349

Vulnerability Information
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Vulnerability Title
TDengine: Off-by-One Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
TDengine is an open source, time-series database optimized for Internet of Things devices. In 3.4.1.6 and earlier, source/libs/parser/src/parUtil.c trimString() checks space for only one byte before processing SQL string escape sequences \%, \_, or \x, allowing a one-byte out-of-bounds write to the stack buffer tmpTokenBuf that can cause denial of service and potentially remote code execution. This issue is fixed in version 3.4.1.14.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
TDengine 缓冲区错误漏洞
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 3.4.1.14之前版本存在缓冲区错误漏洞，该漏洞源于parUtil.c trimString()函数在处理SQL字符串转义序列时仅检查一个字节的空间，导致堆栈缓冲区tmpTokenBuf出现单字节越界写入，可能造成拒绝服务和远程代码执行。
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 < 3.4.1.14 -

II. Public POCs for CVE-2026-62349

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III. Intelligence Information for CVE-2026-62349

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Vendor Advisories for CVE-2026-62349 (1)

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

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
CVE-2026-62355 5.4 MEDIUM TDengine: Standard User permission unexpect

IV. Related Vulnerabilities

Same product: TDengine
Same vendor: taosdata
Same weakness: CWE-121

V. Comments for CVE-2026-62349

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