Traefik: TCP readTimeout bypass via STARTTLS on Postgres

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Summary

CVECVE-2026-25949
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-12 20:16:11 UTC
Updated2026-06-30 03:17:46 UTC
DescriptionTraefik 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.007090000 probability, percentile 0.489370000 (date 2026-07-01)

Problem Types: CWE-400 | CWE-770 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-770 Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1ADPCVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Traefik Traefik All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Traefik Traefik affected < 3.6.8 Not specified
ADP Red Hat Red Hat OpenShift Dev Spaces 3.27 Not specified Not specified

References

ReferenceSourceLinkTags
github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678 [email protected] github.com Patch
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25949.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w [email protected] github.com Patch, Vendor Advisory
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:6192 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/traefik/traefik/releases/tag/v3.6.8 [email protected] github.com Product, Release Notes
access.redhat.com/security/cve/CVE-2026-25949 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-02-12T21:01:13.761ZReported to Red Hat.
ADP2026-02-12T20:01:19.600ZMade public.

Solutions

ADP: RHSA-2026:6192: Red Hat OpenShift Dev Spaces 3.27

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