hyperledger fabric up to 2.2.26 Channel.java readObject deserialization

Summaryinfo

A vulnerability marked as critical has been reported in hyperledger fabric up to 2.2.26. This impacts the function readObject of the file Channel.java. The manipulation leads to deserialization. This vulnerability is traded as CVE-2026-41586. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in hyperledger fabric up to 2.2.26. It has been rated as critical. This issue affects the function readObject of the file Channel.java. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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 patches.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-41586 since 04/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/07/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• hyperledger

Name

• fabric

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.2.10
• 2.2.11
• 2.2.12
• 2.2.13
• 2.2.14
• 2.2.15
• 2.2.16
• 2.2.17
• 2.2.18
• 2.2.19
• 2.2.20
• 2.2.21
• 2.2.22
• 2.2.23
• 2.2.24
• 2.2.25
• 2.2.26

Website

• Product: https://github.com/hyperledger/fabric/

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