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CVE-2026-62353— TDengine: Authenticated Out-of-Bounds Read in SQL Lexer tGetToken

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SQL字符串字面量中尾部反斜杠的处理问题，导致解析过程中读取超出空终止符一个字节，可能允许经过身份验证的用户提交SQL查询时导致服务器崩溃并泄露相邻内存。

CVSS 5.4 · Medium EPSS 0.33% · P24

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-2026-62353

Vulnerability Information
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Vulnerability Title
TDengine: Authenticated Out-of-Bounds Read in SQL Lexer tGetToken
Source: CVE Program / CVE List V5
Vulnerability Description
TDengine is a time-series database optimized for Internet of Things devices. Prior to 3.4.1.14, source/libs/parser/src/parTokenizer.c tGetToken() incremented past a trailing backslash in a SQL string literal such as 'abc\ and read one byte beyond the null terminator, allowing an authenticated user who can submit SQL queries to crash the server and possibly leak adjacent memory. 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:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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SQL字符串字面量中尾部反斜杠的处理问题，导致解析过程中读取超出空终止符一个字节，可能允许经过身份验证的用户提交SQL查询时导致服务器崩溃并泄露相邻内存。
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-2026-62353

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III. Intelligence Information for CVE-2026-62353

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Vendor Advisories for CVE-2026-62353 (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-2026-62355 5.4 MEDIUM TDengine: Standard User permission unexpect

IV. Related Vulnerabilities

Same product: TDengine
Same vendor: taosdata
Same weakness: CWE-125

V. Comments for CVE-2026-62353

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