CVE-2022-41723Network attack vector

Service interruption via repeated HPACK Huffman decoding

Published Feb 28, 2023 · Updated May 5, 2025

Denial of service in Go net/http before 1.19.6 and 1.20.0, and x/net/http2 before 0.7.0, allows remote attackers to exhaust CPU. In Decoder.parseFieldLiteral, a partial field with two Huffman strings causes the first string to be decoded again on each parse attempt before all data arrives, producing quadratic work. A small number of unauthenticated HTTP/2 requests can monopolize CPU and interrupt an affected client or server without reading or changing data.

CVSS severity7.5
High
EPSS probability4.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Go net/http before 1.19.6 and 1.20.0, and x/net/http2 before 0.7.0, allows remote attackers to exhaust CPU. In Decoder.parseFieldLiteral, a partial field with two Huffman strings causes the first string to be decoded again on each parse attempt before all data arrives, producing quadratic work. A small number of unauthenticated HTTP/2 requests can monopolize CPU and interrupt an affected client or server without reading or changing data.

The record

CVE
CVE-2022-41723
Published
Feb 28, 2023
Updated
May 5, 2025
Vendor
Go standard library
Product
net/http
Classifications
T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2023CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.19.6
  2. Affected versionversion=1.20.0-0 <1.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · net/httpversion=0 <1.19.6; version=1.20.0-0 <1.20.1
golang.org/x/net · golang.org/x/net/http2/hpackversion=0 <0.7.0
golang.org/x/net · golang.org/x/net/http2version=0 <0.7.0

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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