CVE-2022-41721: Golang.org/x/net Golang.org/x/net/http2/h2c Vulnerable To Request Smuggling Vulnerability

HIGH
Advisory Identifier: GHSA-fxg5-wq6x-vr4w
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CVSS 7.5
CWE-444
Published
Advisory Summary

CVE-2022-41721 is a HIGH (CVSS 7.5) golang.org/x/net/http2/h2c vulnerable to request smuggling vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Golang.org/x/net libraries in the Go ecosystem. The issue involves golang.org/x/net/http2/h2c vulnerable to request smuggling attack. Remediation is available by upgrading affected packages to version 0.1.1-0.20221104162952-702349b0e862.

CVE-2022-41721 at a Glance

CVE Identifier CVE-2022-41721
GHSA Identifier GHSA-fxg5-wq6x-vr4w
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Product Golang.org/x/net
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2022-41721

To remediate this vulnerability, upgrade all affected Golang.org/x/net dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

golang.org/x/net fixed: 0.1.1-0.20221104162952-702349b0e862 
Upgrade golang.org/x/net to 0.1.1-0.20221104162952-702349b0e862
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for golang.org/x/net

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-41721, inspect your project dependencies for Golang.org/x/net:

inspect dependencies for golang.org/x/net

Analyze the terminal output to locate any version of Golang.org/x/net in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.1-0.20221104162952-702349b0e862), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where the product acts as an intermediary http agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed http requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. In Golang.org/x/net, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A request smuggling attack is possible when using MaxBytesHandler. When using MaxBytesHandler, the body of an HTTP request is not fully consumed. When the server attempts to read HTTP2 frames from the connection, it will instead be reading the body of the HTTP request, which could be attacker-manipulated to represent arbitrary HTTP2 requests. ### Specific Go Packages Affected golang.org/x/net/http2/h2c

CVE-2022-41721 Affected Golang.org/x/net Versions

1 component(s)
Fixed Versions:
0.1.1-0.20221104162952-702349b0e862
Product / Package Ecosystem Affected Versions Fixed Version
golang.org/x/net
golang/golang.org/x/net
Go
≥ 0.0.0-20220524220425-1d687d428aca
< 0.1.1-0.20221104162952-702349b0e862
0.1.1-0.20221104162952-702349b0e862

References

NVD — CVE-2022-41721 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-41721
cs.opensource.google/go/x/net PACKAGE
https://cs.opensource.google/go/x/net
go.dev/cl/447396 WEB
https://go.dev/cl/447396
go.dev/issue/56352 WEB
https://go.dev/issue/56352
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X3H3EWQXM2XL5AGBX6UL443JEJ3GQXJN
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X5DXTLLWN6HKI5I35EUZRBISTNZJ75GP
pkg.go.dev/vuln/go-2023-1495 WEB
https://pkg.go.dev/vuln/GO-2023-1495

Frequently Asked Questions

What is CVE-2022-41721?
CVE-2022-41721 is a security vulnerability in Golang.org/x/net involving golang.org/x/net/http2/h2c vulnerable to request smuggling attack under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling').
Which Golang.org/x/net versions are affected?
Affected versions include releases prior to 0.1.1-0.20221104162952-702349b0e862 across affected packages: golang.org/x/net.
What version fixes CVE-2022-41721?
Upgrading to 0.1.1-0.20221104162952-702349b0e862 (or the latest patched release for your respective branch) resolves the vulnerability.
Is golang.org/x/net affected?
Yes, golang.org/x/net is affected in releases prior to 0.1.1-0.20221104162952-702349b0e862. Upgrade your dependency to 0.1.1-0.20221104162952-702349b0e862 or later.
What is the CVSS score of CVE-2022-41721?
CVE-2022-41721 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-41721?
CVE-2022-41721 is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.).
How can I check Go dependencies for CVE-2022-41721?
Run the dependency tree command: 'inspect dependencies for golang.org/x/net'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fxg5-wq6x-vr4w",
  "modified" : "2025-04-04T19:26:05Z",
  "published" : "2023-01-14T00:30:23Z",
  "aliases" : [ "CVE-2022-41721" ],
  "summary" : "golang.org/x/net/http2/h2c vulnerable to request smuggling attack",
  "details" : "A request smuggling attack is possible when using MaxBytesHandler. When using MaxBytesHandler, the body of an HTTP request is not fully consumed. When the server attempts to read HTTP2 frames from the connection, it will instead be reading the body of the HTTP request, which could be attacker-manipulated to represent arbitrary HTTP2 requests.\n\n### Specific Go Packages Affected\ngolang.org/x/net/http2/h2c",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "golang.org/x/net"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.0.0-20220524220425-1d687d428aca"
      }, {
        "fixed" : "0.1.1-0.20221104162952-702349b0e862"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-41721"
  }, {
    "type" : "PACKAGE",
    "url" : "https://cs.opensource.google/go/x/net"
  }, {
    "type" : "WEB",
    "url" : "https://go.dev/cl/447396"
  }, {
    "type" : "WEB",
    "url" : "https://go.dev/issue/56352"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X3H3EWQXM2XL5AGBX6UL443JEJ3GQXJN"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X5DXTLLWN6HKI5I35EUZRBISTNZJ75GP"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2023-1495"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-444" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-01-20T22:40:06Z",
    "nvd_published_at" : "2023-01-13T23:15:00Z"
  }
}