CVE-2023-29013 HTTP header parsing could cause a deny of service
Attackers can cause a denial of service in Traefik by sending crafted HTTP headers that trigger excessive memory allocation during parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-29013?
CVE-2023-29013 is a high-severity denial of service vulnerability in Traefik Traefik, published on 14 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2023-29013?
4 open source packages ship an affected version, including github.com/traefik/traefik/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v2 Go | All versions | 2.9.10 |
github.com/traefik/traefik/v2 Go | All versions | 2.9.10 |
github.com/traefik/traefik/v2 Go | From 2.10.0-rc1 | 2.10.0-rc2 |
github.com/traefik/traefik/v2 Go | From 2.10.0-rc1 | 2.10.0-rc2 |
Products include Traefik Traefik.
How do I fix CVE-2023-29013?
Upgrade github.com/traefik/traefik/v2 to a fixed version for your release line: 2.9.10 or 2.10.0-rc2.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-29013 being exploited?
There is no known exploitation of CVE-2023-29013 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as ECHO-f5d5-6383-3505, GHSA-7hj9-rv74-5g92.