CVE-2026-41586: Hyperledger Fabric is an enterprise-grade permissioned distributed ledger framework for developing solutions a

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-41586 is a critical-severity flaw (CVSS 9.8) affecting fabric. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hyperledger Fabric is an enterprise-grade permissioned distributed ledger framework for developing solutions and applications. From versions 1.0.0 to 2.2.26, Channel.java implements readObject() and exposes deSerializeChannel() which call ObjectInputStream.readObject() on untrusted byte arrays without configuring an ObjectInputFilter. This is a classic Java deserialization RCE pattern. At time of publication, there are no publicly available patch

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-05-07
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-05-07 06:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

hyperledger fabric UPGRADE

Affected: >= 1.0.0 and <= 2.2.26

Fixed in: newer than 2.2.26

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. UPGRADE to newer than 2.2.26 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fabric

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 1.0.0 (Debian / Ubuntu)

apt-cache madison fabric sudo apt install fabric=<VERSION_BEFORE_1.0.0> sudo apt-mark hold fabric

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

dnf --showduplicates list fabric sudo dnf downgrade fabric-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add fabric

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-2026-41586?

fabric: upgrade to newer than 2.2.26. Exact commands for each OS are on this page.

Is CVE-2026-41586 being exploited?

CVE-2026-41586 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-2026-41586 affect?

CVE-2026-41586 affects fabric. Severity is critical (CVSS 9.8). Hyperledger Fabric is an enterprise-grade permissioned distributed ledger framework for developing solutions and applications. From versions 1.0.0 to 2.2.26, Channel.java implements readObject() and exposes deSerializeChannel() which call O

How urgent is CVE-2026-41586?

Priority 55/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-63509 CRITICAL 9.9 MITIGATE Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network
CVE-2026-69843 CRITICAL 10.0 MITIGATE Authentication bypass by spoofing in Microsoft Fabric allows an unauthorized attacker to elevate privileges ov
CVE-2026-70178 HIGH 8.5 MITIGATE Missing authorization in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

References

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