CVE-2022-41721

Request smuggling due to improper request handling in golang.org/x/net/http2/h2c

HIGH
7.5
CVSS Score
Published: January 13, 2023 at 10:46 PM UTC
Updated: June 17, 2026 at 05:03 AM UTC
2 products affected across 2 vendorsH2CH2C

Using golang.org/x/net/http2/h2c by golang.org/x/net?

Get instant alerts when new vulnerabilities affect golang.org/x/net/http2/h2c - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2022-11-04
Affected range stops below 2022-11-04, so it looks safe — our inference, not a vendor statement
0.0.0-20220524220425-1d687d428aca ≤ v < 0.1.1-0.20221104162952-702349b0e8620.0.0-20220524220425-1d687d428aca
Affected range stops below 0.1.1-0.20221104162952-702349b0e862, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-444

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card