Summary
golang.org/x/net/http2/h2c vulnerable to request smuggling attack
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
Impact
CVE-2022-41721 has a CVSS score of 7.5 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.1.1-0.20221104162952-702349b0e862); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2022-41721? CVE-2022-41721 is a high-severity security vulnerability in golang.org/x/net (go), affecting versions >= 0.0.0-20220524220425-1d687d428aca, < 0.1.1-0.20221104162952-702349b0e862. It is fixed in 0.1.1-0.20221104162952-702349b0e862.
- How severe is CVE-2022-41721? CVE-2022-41721 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of golang.org/x/net are affected by CVE-2022-41721? golang.org/x/net (go) versions >= 0.0.0-20220524220425-1d687d428aca, < 0.1.1-0.20221104162952-702349b0e862 is affected.
- Is there a fix for CVE-2022-41721? Yes. CVE-2022-41721 is fixed in 0.1.1-0.20221104162952-702349b0e862. Upgrade to this version or later.
- Is CVE-2022-41721 exploitable, and should I be worried? Whether CVE-2022-41721 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2022-41721 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2022-41721? Upgrade
golang.org/x/netto 0.1.1-0.20221104162952-702349b0e862 or later.