CVE-2026-119574
Published:October 30, 2026
Updated:November 04, 2026
Traefik from 3.2.0 before 3.7.15 contains a data race in the experimental FastProxy that allows unauthenticated attackers to crash the process by abusing HTTP/1 protocol upgrades. Attackers can repeatedly open and abort upgraded connections such as WebSocket, corrupting the unsynchronized shared bufio.Reader and triggering an unrecovered panic that terminates Traefik.
Affected Packages
https://github.com/traefik/traefik.git (GITHUB):
Affected version(s) >=v3.2.0 <v3.7.15Fix Suggestion:
Update to version v3.7.15github.com/traefik/traefik/v3 (GO):
Affected version(s) >=v3.2.0 <v3.7.15Fix Suggestion:
Update to version v3.7.15Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Unsynchronized Access to Shared Data in a Multithreaded Context
EPSS
Base Score:
0.28