---
title: "CVE-2026-41586: fabric-sdk-java has ObjectInputStream.readObject() without ObjectInputFilter, which allows Java deserialization RCE"
url: https://erroneo.us/security/cve/CVE-2026-41586/
description: "CVE-2026-41586 (org.hyperledger.fabric-sdk-java:fabric-sdk-java (Maven)): Hyperledger Fabric is an enterprise-grade permissioned distributed ledger…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-07
date_modified: 2026-05-20
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-41586"
kev: false
cvss: 9.3
epss: 0.00631
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-41586: fabric-sdk-java has ObjectInputStream.readObject() without ObjectInputFilter, which allows Java deserialization RCE

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 50: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 50% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.hyperledger.fabric-sdk-java:fabric-sdk-java (Maven) >= 1.0.0, <= 2.2.26, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it 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.

## Affected packages

- Maven `org.hyperledger.fabric-sdk-java:fabric-sdk-java` >= 1.0.0, <= 2.2.26 → fixed: none listed

## Affected products (CVE record)

- hyperledger fabric: >= 1.0.0, <= 2.2.26

## Severity

- GitHub_M CVSS 4.0: 9.3 `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`
- GitHub CVSS 4.0: 9.3 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.63% probability of exploitation activity in the next 30 days; percentile 50.

## Sources

- [GitHub Advisory GHSA-prf8-cf2x-rhx7](https://github.com/advisories/GHSA-prf8-cf2x-rhx7)
- [CVE.org record CVE-2026-41586](https://www.cve.org/CVERecord?id=CVE-2026-41586)
- [NVD entry CVE-2026-41586](https://nvd.nist.gov/vuln/detail/CVE-2026-41586)
- [github.com](https://github.com/hyperledger/fabric/security/advisories/GHSA-prf8-cf2x-rhx7)
- [hyperledger.github.io](https://hyperledger.github.io/fabric-gateway)

---
Source page: https://erroneo.us/security/cve/CVE-2026-41586/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt