CVE-2026-41586 ObjectInputStream.readObject() without ObjectInputFilter in fabric-sdk-java allows Java deserialization RCE
Attackers can execute arbitrary code via unsafe Java deserialization in the Hyperledger Fabric SDK when processing untrusted data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41586?
CVE-2026-41586 is a critical unsafe deserialization vulnerability in hyperledger fabric, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-41586?
5 open source packages ship an affected version, including org.hyperledger.fabric-sdk-java:fabric-sdk-java, hyperledger-fabric-orderer and hyperledger-fabric-peer. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.hyperledger.fabric-sdk-java:fabric-sdk-java Maven | From 1.0.0 to 2.2.26 | None |
org.hyperledger.fabric-sdk-java:fabric-sdk-java Maven | From 1.0.0 to 2.2.26 | None |
hyperledger-fabric-orderer Bitnami | From 1.0.0 | 2.5.9 |
hyperledger-fabric-peer Bitnami | From 1.0.0 | 2.5.9 |
hyperledger-fabric-tools Bitnami | From 1.0.0 | 2.5.9 |
Products include Hyperledger Fabric.
How do I fix CVE-2026-41586?
No fix published yet.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-41586 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41586 exists.
Other vulnerabilities in hyperledger fabric
- CVE-2022-45196 Denial of service in n/a
- CVE-2022-31121 Improper Input Validation in fabric hyperledger
- CVE-2023-46132 Crosslinking transaction attack in hyperledger/fabric
- CVE-2022-36023 Remote denial of service in Hyperledger Fabric Gateway
- CVE-2024-45244 Hyperledger Fabric does not verify request has a timestamp within the expected time window
Sources
Also known as BIT-hyperledger-fabric-orderer-2026-41586, BIT-hyperledger-fabric-peer-2026-41586, BIT-hyperledger-fabric-tools-2026-41586, GHSA-prf8-cf2x-rhx7.