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

7.5HIGH

Key Information:

Vendor

Taosdata

Status
Tdengine
Vendor
CVE Published:
10 June 2026

What is CVE-2026-42542?

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.

Affected Version(s)

TDengine >= 3.4.0.0, < 3.4.1.6

References

https://github.com/taosdata/TDengine/security/advisories/...
x_refsource_CONFIRM
https://github.com/taosdata/TDengine/releases/tag/ver-3.4...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.