What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-04-14 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• Traefik: before 2.9.10; 2.10.0-rc1 — fixed in 2.9.10

How to fix

Upgrade to a fixed version: Traefik 2.9.10. Check the vendor advisory for mitigations.

References

• 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://github.com/traefik/traefik/security/advisories/GHSA-7hj9-rv74-5g92
• https://security.netapp.com/advisory/ntap-20230517-0008/
• 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://github.com/traefik/traefik/security/advisories/GHSA-7hj9-rv74-5g92
• https://security.netapp.com/advisory/ntap-20230517-0008/

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