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CVE-2024-28869: Possible denial of service vulnerability with Content-length header in Traefik

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-12 · updated 2026-06-17
• Weakness: CWE-755

Description

Traefik is an HTTP reverse proxy and load balancer. In affected versions sending a GET request to any Traefik endpoint with the "Content-length" request header results in an indefinite hang with the default configuration. This vulnerability can be exploited by attackers to induce a denial of service. This vulnerability has been addressed in version 2.11.2 and 3.0.0-rc5. Users are advised to upgrade. For affected versions, this vulnerability can be mitigated by configuring the readTimeout option.

Affected products

• Traefik: before 2.11.2; 3.0.0, 3.0.0-beta1, 3.0.0-beta2, 3.0.0-beta3, 3.0.0-beta4, 3.0.0-beta5 (+4) — fixed in 2.11.2

How to fix

Upgrade to a fixed version: Traefik 2.11.2. Check the vendor advisory for mitigations.

References

• https://doc.traefik.io/traefik/routing/entrypoints/#respondingtimeouts
• https://github.com/traefik/traefik/commit/240b83b77351dfd8cadb91c305b84e9d22e0f9c6
• https://github.com/traefik/traefik/releases/tag/v2.11.2
• https://github.com/traefik/traefik/releases/tag/v3.0.0-rc5
• https://github.com/traefik/traefik/security/advisories/GHSA-4vwx-54mw-vqfw
• https://doc.traefik.io/traefik/routing/entrypoints/#respondingtimeouts
• https://github.com/traefik/traefik/commit/240b83b77351dfd8cadb91c305b84e9d22e0f9c6
• https://github.com/traefik/traefik/releases/tag/v2.11.2
• https://github.com/traefik/traefik/releases/tag/v3.0.0-rc5
• https://github.com/traefik/traefik/security/advisories/GHSA-4vwx-54mw-vqfw

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