CVE-2026-42542: TDengine is an open source, time-series database optimized for Internet of Things devices

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-42542 is a high-severity flaw (CVSS 7.5) affecting tdengine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-191
Published	2026-06-10
Last modified	2026-07-23

Publisher (CNA): GitHub, Inc. · Vendor: tdengine

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-10 22:16 UTCPublished CVE record published
2026-07-23 09:10 UTCUpdated Record last modified

tdengine tdengine UPGRADE

Affected: >= 3.4.0.0 and < 3.4.1.6

Fixed in: 3.4.1.6

Safe to downgrade to: a release before 3.4.0.0

1. Check installed version

apt-cache policy tdengine || rpm -q tdengine || tdengine --version

2. UPGRADE to 3.4.1.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tdengine

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tdengine

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.4.0.0 (Debian / Ubuntu)

apt-cache madison tdengine sudo apt install tdengine=<VERSION_BEFORE_3.4.0.0> sudo apt-mark hold tdengine

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list tdengine sudo dnf downgrade tdengine-<VERSION_BEFORE_3.4.0.0> sudo dnf versionlock add tdengine

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42542?

tdengine: upgrade to 3.4.1.6. Exact commands for each OS are on this page.

Is CVE-2026-42542 being exploited?

CVE-2026-42542 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42542 affect?

CVE-2026-42542 affects tdengine. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-42542?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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