What’s Vulnerable › Vulnerabilities

CVE-2026-41586: ObjectInputStream.readObject() without ObjectInputFilter in fabric-sdk-java allows Java deserialization RCE

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-07 · updated 2026-10-26
• Weakness: CWE-502

Description

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.

Affected products

• hyperledger fabric: from 1.0.0 through 2.2.26

References

• https://github.com/hyperledger/fabric/security/advisories/GHSA-prf8-cf2x-rhx7
• https://hyperledger.github.io/fabric-gateway
• https://github.com/hyperledger/fabric/security/advisories/GHSA-prf8-cf2x-rhx7

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