CVE-2026-42542 TDengine has an integer underflow in uvConnMayGetUserInfo() allows unauthenticated remote crash (DoS)
Unauthenticated remote attackers can crash the TDengine server via a crafted RPC packet due to an integer underflow, requiring an upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42542?
CVE-2026-42542 is a high-severity vulnerability in taosdata TDengine, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-191
Which versions are affected by CVE-2026-42542?
It affects 1 product.
Products include Tdengine Tdengine.
How do I fix CVE-2026-42542?
No fix has been published for CVE-2026-42542 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-42542 being exploited?
There is no known exploitation of CVE-2026-42542 in the wild and no public exploit code.
Other vulnerabilities in taosdata TDengine
Sources
Also known as GHSA-vg95-j2hf-hvjx.