CVE-2026-11576: The security fix for CVE-2025-0728 in eclipse-threadx NetX Duo refactors error handling in the HTTP server PUT

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HIGH 7.5REMOTEUPGRADE

CVE-2026-11576 is a high-severity flaw (CVSS 7.5) affecting threadx netx duo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The security fix for CVE-2025-0728 in eclipse-threadx NetX Duo refactors error handling in the HTTP server PUT process to use a shared cleanup label, but this unified cleanup path unconditionally calls fx_file_close() even when the file was never successfully opened. Multiple error branches jump to the shared cleanup label before any file open operation has occurred, causing fx_file_close() to operate on an uninitialized file handle, leading to u

Why this priority

High severity
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	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-415, CWE-459, CWE-908
Published	2026-06-19
Last modified	2026-10-26

Publisher (CNA): Eclipse Foundation · Vendor: eclipse

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 10:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

eclipse threadx netx duo UPGRADE

Affected: >= 6.4.2 and <= 6.5.0.202601

Fixed in: newer than 6.5.0.202601

Safe to downgrade to: a release before 6.4.2

1. Check installed version

apt-cache policy threadx-netx-duo || rpm -q threadx-netx-duo || threadx-netx-duo --version

2. UPGRADE to newer than 6.5.0.202601 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade threadx-netx-duo

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade threadx-netx-duo

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 6.4.2 (Debian / Ubuntu)

apt-cache madison threadx-netx-duo sudo apt install threadx-netx-duo=<VERSION_BEFORE_6.4.2> sudo apt-mark hold threadx-netx-duo

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

dnf --showduplicates list threadx-netx-duo sudo dnf downgrade threadx-netx-duo-<VERSION_BEFORE_6.4.2> sudo dnf versionlock add threadx-netx-duo

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-2026-11576?

threadx netx duo: upgrade to newer than 6.5.0.202601. Exact commands for each OS are on this page.

Is CVE-2026-11576 being exploited?

CVE-2026-11576 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-2026-11576 affect?

CVE-2026-11576 affects threadx netx duo. Severity is high (CVSS 7.5). The security fix for CVE-2025-0728 in eclipse-threadx NetX Duo refactors error handling in the HTTP server PUT process to use a shared cleanup label, but this unified cleanup path unconditionally calls fx_file_close() even when the file was

How urgent is CVE-2026-11576?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

References

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