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CVE-2026-26999— Traefik: tcp router clears read deadlines before tls forwarding, enabling stalled handshakes (slowloris doS)

Quick assessment

Affected
traefik traefik
Exploitation
Public or AI PoC available; prioritize validation
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之前版本存在资源管理错误漏洞，该漏洞源于TCP路由器处理TLS握手时存在缺陷，可能导致远程未经验证的客户端通过发送不完整的TLS记录来耗尽文件描述符和goroutine，从而降低服务可用性。

CVSS 7.5 · High EPSS 0.73% · P53

Affected Version Matrix 2

VendorProduct Version RangeStatus
traefik traefik < 2.11.38 affected
< 3.6.9 affected
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I. Basic Information for CVE-2026-26999

Vulnerability Information
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Vulnerability Title
Traefik: tcp router clears read deadlines before tls forwarding, enabling stalled handshakes (slowloris 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 TLS handshake on TCP routers. When Traefik processes a TLS connection on a TCP router, the read deadline used to bound protocol sniffing is cleared before the TLS handshake is completed. When a TLS handshake read error occurs, the code attempts a second handshake with different connection parameters, silently ignoring the initial error. A remote unauthenticated client can exploit this by sending an incomplete TLS record and stopping further data transmission, causing the TLS handshake to stall indefinitely and holding connections open. By opening many such stalled connections in parallel, an attacker can exhaust file descriptors and goroutines, degrading availability of all services on the affected entrypoint. 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:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于TCP路由器处理TLS握手时存在缺陷，可能导致远程未经验证的客户端通过发送不完整的TLS记录来耗尽文件描述符和goroutine，从而降低服务可用性。
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-2026-26999

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8376 chars
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III. Intelligence Information for CVE-2026-26999

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Vendor Advisories for CVE-2026-26999 (1)

Vendor Pages for CVE-2026-26999 (2)

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

CVE-2026-29054 7.5 HIGH Traefik: lowercase `Connection` tokens can delete traefik-managed forwarded identity heade
CVE-2026-26998 4.4 MEDIUM Traefik: unbounded io.ReadAll on auth server response body causes OOM denial of service(DO

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-400

V. Comments for CVE-2026-26999

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