CVE-2026-41586Public exploitNetwork attack vector

Code execution via unfiltered Channel deserialization

Published May 7, 2026 · Updated May 7, 2026

Deserialization of untrusted data in Hyperledger Fabric SDK for Java 1.0.0 through 2.2.26 allows remote attackers to execute code. Channel.deSerializeChannel() passes attacker-controlled channel bytes to ObjectInputStream.readObject() without an ObjectInputFilter, enabling gadget-chain execution. Exploitation requires an embedding client application to accept or load crafted channel data; Fabric peers do not transmit this data.

CVSS severity9.3
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Hyperledger Fabric SDK for Java 1.0.0 through 2.2.26 allows remote attackers to execute code. Channel.deSerializeChannel() passes attacker-controlled channel bytes to ObjectInputStream.readObject() without an ObjectInputFilter, enabling gadget-chain execution. Exploitation requires an embedding client application to accept or load crafted channel data; Fabric peers do not transmit this data.

The record

CVE
CVE-2026-41586
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Hyperledger Foundation
Product
Hyperledger Fabric
Classifications
CWE-502, CAPEC-586, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.0.0, <= 2.2.26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hyperledger Foundation · Hyperledger Fabricversion=>= 1.0.0, <= 2.2.26

Published CVSS scores

9.3GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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