Vulnerability · Published May 7, 2026 · Assigned by GitHub_M

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

Critical 9.3

In plain English

A critical-severity unsafe deserialization in fabric from hyperledger. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.5%top 55.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	org.hyperledger.fabric-sdk-java:fabric-sdk-java	no fix listed	GHSA-prf8-cf2x-rhx7

Affected products (as reported)

Vendor	Product	Versions
hyperledger	fabric	>= 1.0.0, <= 2.2.26

Weakness: CWE-502 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

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