CVE-2026-8741: A vulnerability has been found in EMQX up to 6.2.0

Routine

LOW 3.1UPGRADE

CVE-2026-8741 is a low-severity flaw (CVSS 3.1) affecting emqx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in EMQX up to 6.2.0. This affects an unknown function of the file apps/emqx/src/emqx_persistent_session_ds.erl of the component QoS 2 PUBLISH Packet Handler. Such manipulation leads to race condition. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit has been disclosed to the public and may be used. The vendor was

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-362
Published	2026-05-17
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: emqx

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-17 09:16 UTCPublished CVE record published
2026-06-17 11:04 UTCUpdated Record last modified

emqx emqx UPGRADE

Affected: >= 5.0.0 and <= 6.2.0

Fixed in: newer than 6.2.0

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. UPGRADE to newer than 6.2.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade emqx

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 5.0.0 (Debian / Ubuntu)

apt-cache madison emqx sudo apt install emqx=<VERSION_BEFORE_5.0.0> sudo apt-mark hold emqx

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

dnf --showduplicates list emqx sudo dnf downgrade emqx-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add emqx

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-2026-8741?

emqx: upgrade to newer than 6.2.0. Exact commands for each OS are on this page.

Is CVE-2026-8741 being exploited?

CVE-2026-8741 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-2026-8741 affect?

CVE-2026-8741 affects emqx. Severity is low (CVSS 3.1). A vulnerability has been found in EMQX up to 6.2.0. This affects an unknown function of the file apps/emqx/src/emqx_persistent_session_ds.erl of the component QoS 2 PUBLISH Packet Handler. Such manipulation leads to race condition. The atta

How urgent is CVE-2026-8741?

Priority 21/100. Public exploit reference

References

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