CVE-2022-41723: Denial of service via crafted HTTP/2 stream in net/http and golang.org/x/net

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-28 · updated 2026-06-17

Description

A maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder, sufficient to cause a denial of service from a small number of small requests.

Affected products

Go: before 1.19.6; 1.20.0 — fixed in 1.19.6
Golang Hpack: before 0.7.0 — fixed in 0.7.0
Golang Http2: before 0.7.0 — fixed in 0.7.0
Golang.Org/X/Net: before 0.7.0 — fixed in 0.7.0
Go Stdlib: before 1.19.6; from 1.20.0-0 before 1.20.1 — fixed in 1.19.6, 1.20.1

How to fix

Upgrade to a fixed version: Go 1.19.6; Golang Hpack 0.7.0; Golang Http2 0.7.0; Golang.Org/X/Net 0.7.0; Go Stdlib 1.19.6, 1.20.1. Check the vendor advisory for mitigations.

References

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