CVE-2026-25949

HIGH

Traefik < 3.6.8 - Unauthenticated Denial of Service via STARTTLS Request Bypass

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-25949. PoCs published by dwisiswant0.

AI-analyzed exploit summary This repository contains a functional exploit PoC for CVE-2026-25949, a denial-of-service vulnerability in Traefik v3.6.7 and earlier. The exploit demonstrates how sending a Postgres SSLRequest and stalling can bypass readTimeout, leading to file descriptor exhaustion.

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests. An unauthenticated client can bypass Traefik entrypoint respondingTimeouts.readTimeout by sending the 8-byte Postgres SSLRequest (STARTTLS) prelude and then stalling, causing connections to remain open indefinitely, leading to a denial of service. This vulnerability is fixed in 3.6.8.

Exploits (1)

github WORKING POC 1 stars
by dwisiswant0 · pythonpoc
https://github.com/dwisiswant0/neo-pocs/tree/master/2026/CVE-2026-25949

This repository contains a functional exploit PoC for CVE-2026-25949, a denial-of-service vulnerability in Traefik v3.6.7 and earlier. The exploit demonstrates how sending a Postgres SSLRequest and stalling can bypass readTimeout, leading to file descriptor exhaustion.

Classification
Working Poc 100%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Traefik v3 <= 3.6.7
No auth needed
Prerequisites: Network access to Traefik TCP entry point
devstral-2 · analyzed May 14, 2026 Full analysis →

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0062
EPSS Percentile 45.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (2)
traefik/traefik < 3.6.8
traefik/traefik 0 - 3.6.8Go
Published Feb 12, 2026
Tracked Since Feb 18, 2026