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CVE-2026-26998— Traefik: unbounded io.ReadAll on auth server response body causes OOM denial of service(DOS)

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Traefik是Traefik开源的一款开源的反向代理与负载均衡工具。 Traefik 2.11.38之前版本和3.6.9之前版本存在安全漏洞，该漏洞源于ForwardAuth中间件处理响应时无大小限制，可能导致内存耗尽和进程崩溃，从而引发拒绝服务。

CVSS 4.4 · Medium EPSS 0.57% · P46
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I. Basic Information for CVE-2026-26998

Vulnerability Information
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Vulnerability Title
Traefik: unbounded io.ReadAll on auth server response body causes OOM denial of service(DOS)
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.38 and 3.6.9, there is a potential vulnerability in Traefik managing the ForwardAuth middleware responses. When Traefik is configured to use the ForwardAuth middleware, the response body from the authentication server is read entirely into memory without any size limit. There is no maxResponseBodySize configuration to restrict the amount of data read from the authentication server response. If the authentication server returns an unexpectedly large or unbounded response body, Traefik will allocate unlimited memory, potentially causing an out-of-memory (OOM) condition that crashes the process. This results in a denial of service for all routes served by the affected Traefik instance. This issue has been patched in versions 2.11.38 and 3.6.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik开源的一款开源的反向代理与负载均衡工具。 Traefik 2.11.38之前版本和3.6.9之前版本存在安全漏洞，该漏洞源于ForwardAuth中间件处理响应时无大小限制，可能导致内存耗尽和进程崩溃，从而引发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik < 2.11.38 -

II. Public POCs for CVE-2026-26998

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III. Intelligence Information for CVE-2026-26998

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Vendor Advisories for CVE-2026-26998 (1)

Vendor Pages for CVE-2026-26998 (2)

Same Patch Batch · traefik · 2026-03-05 · 3 CVEs total

CVE-2026-26999 7.5 HIGH Traefik: tcp router clears read deadlines before tls forwarding, enabling stalled handshak
CVE-2026-29054 7.5 HIGH Traefik: lowercase `Connection` tokens can delete traefik-managed forwarded identity heade

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-770

V. Comments for CVE-2026-26998

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