Threat Intelligence / CVE / CVE-2026-42542

CVE-2026-42542 — Tdengine

CVSS v3.1 7.5 (HIGH) · Priority 5.8/10 · Published 2026-06-10

As of 2026-06-11, CVE-2026-42542 is a HIGH-severity vulnerability in Tdengine, CVSS v3.1 7.5. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-42542, most recently “CVE-2026-42542: TDengine unauthenticated integer underflow lets a single RPC packet crash taosd”.

Last updated: 2026-06-11

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.

The record classifies CVE-2026-42542 under weakness class CWE-191. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 112 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
5.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-10, last modified 2026-06-11

Is CVE-2026-42542 being exploited?

Weaponised exploit code for CVE-2026-42542 is publicly available. 1 public proof-of-concept repository is tracked for this identifier.

Affected products and versions

How to fix CVE-2026-42542

Vendor advisory: https://github.com/taosdata/TDengine/security/advisories/GHSA-vg95-j2hf-hvjx. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-42542

1 tracked threat in the Threadlinqs corpus references CVE-2026-42542, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Other references

Full detection coverage & IOCs for threats exploiting CVE-2026-42542 are available via the Threadlinqs MCP server (Purple tier). View plans →

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