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CVE-2026-25949

Traefik: TCP readTimeout bypass via STARTTLS on Postgres

Published: Feb 12, 2026Updated: Feb 20, 2026 Sources: CVE List NVD GHSACWE-400
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.6%
Top 54.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400

Affected Products

traefiktraefik
On-prem
Networking Infrastructure / load-balancer-proxy
github.com/traefik/traefik/v3GoOSS Libraries
traefikoss-projectNetworking Infrastructureaka traefik enterprise
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678
github.com
https://github.com/traefik/traefik/releases/tag/v3.6.8
github.com
https://github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w
github.com
and 2 more references View all →

Timeline

Published
Feb 12, 2026
Last Updated
Feb 20, 2026

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