HTTP Request Smuggling in github.com/hyperledger/fabric

published 2021-11-18 4 y ago modified 2026-06-17 4 mo ago also GHSA-j96p-r523-8r3w , EUVD-2021-2543

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.0.1, v2.3.0. It can easily break down as many orderers as the attacker wants. This bug can be leveraged by constructing a message whose header is invalid to the interface Order. This bug has been admitted and fixed by the developers of Fabric.

Patch / fix

fixed in 1 links 2

go github.com/hyperledger/fabric 2.4.0

github.com/hyperledger/fabric#2828 pull request
github.com/hyperledger/fabric/releases/tag/v2.4.0-beta release

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
go	github.com/hyperledger/fabric	<2.4.0	2.4.0

Classification

Weakness

CWE-444 Inconsistent Interpretation of HTTP Requests

References

github.com /hyperledger/fabric/pull/2828
web, patch, third-party-advisory
jira.hyperledger.org /browse/FAB-18528
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2021-43669
advisory
github.com /hyperledger/fabric
package
github.com /hyperledger/fabric/releases/tag/v2.4.0-beta
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary