Deserialization in Hyperledger Fabric
CVE-2026-41586
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Hyperledger Fabric — versions >= 1.0.0, <= 2.2.26
Weakness classification (CWE)
References
- github.com/hyperledger/fabric/security/advisories/GHSA-prf8-cf2x-rhx7 (Exploit, Mitigation, Vendor Advisory)
- hyperledger.github.io/fabric-gateway (Product)
Frequently asked questions
- What is CVE-2026-41586?
- CVE-2026-41586 is a critical-severity vulnerability in Hyperledger Fabric, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-05-07.
- How severe is CVE-2026-41586?
- Critical severity. CVSS v3 base score is 9.8 out of 10.