CVE-2026-42542

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.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0054

Probability of exploitation

0.41%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-191 CWE-191

Affected Products

Vendor	Product	Versions
tdengine	tdengine	3.4.0.0 — 3.4.1.6

References

Advisories & Patches

https://github.com/taosdata/TDengine/security/advisories/GHSA-vg95-j2hf-hvjx

Exploits

https://github.com/taosdata/TDengine/security/advisories/GHSA-vg95-j2hf-hvjx

Other References

https://github.com/taosdata/TDengine/releases/tag/ver-3.4.1.6

Frequently Asked Questions

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-42542? +

CVE-2026-42542 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0054, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42542? +

CVE-2026-42542 affects products from tdengine, specifically: tdengine. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42542? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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