How severe is CVE-2026-41586?

CVE-2026-41586 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-41586 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41586?

CVE-2026-41586 affects Hyperledger Fabric. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41586?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-41586 have an EU (EUVD) identifier?

Yes. CVE-2026-41586 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28316.

When was CVE-2026-41586 published?

CVE-2026-41586 was published on 2026-05-07 and last updated on 2026-08-25.

CVE-2026-41586

CVE-2026-41586 is a critical-severity vulnerability in Hyperledger Fabric with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28316
Weakness: CWE-502
Affected product: Hyperledger Fabric
Published: 2026-05-07
Last modified: 2026-08-25

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-41586?: CVE-2026-41586 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-41586 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41586?: CVE-2026-41586 affects Hyperledger Fabric. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41586?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-41586 have an EU (EUVD) identifier?: Yes. CVE-2026-41586 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28316.
When was CVE-2026-41586 published?: CVE-2026-41586 was published on 2026-05-07 and last updated on 2026-08-25.

References

Affected products (1)

cpe:2.3:a:hyperledger:fabric:*:*:*:*:*:*:*:*

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