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Fencer Vulns
high 7.5

CVE-2026-25949 json

Traefik: TCP readTimeout bypass via STARTTLS on Postgres

published 2026-02-12 8 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-6207 , GHSA-89p3-4642-cr2w , GO-2026-4484

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/traefik/traefik/v3 3.6.8
  • Red Hat Red Hat OpenShift Dev Spaces 3.27 1774227265
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1

suse advisories SUSE-SU-2026:0757-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • traefik openSUSE Tumbleweed 3.6.8-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:10217-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-25949 updated cvss 7.5

github.com/traefik/traefik: Traefik: Denial of Service via stalled STARTTLS requests

  • Red Hat OpenShift Dev Spaces 3.27 devspaces 1774227265
    fixed: vendor fix RHSA-2026:6192
  • Red Hat OpenShift Dev Spaces 3.27 devspaces 1773775028, devspaces 1773775064, devspaces 1773775544, devspaces 1774070844, devspaces 1774143680, devspaces 1774155063, +9 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/traefik/traefik/v3
<3.6.8
3.6.8
go github.com/traefik/traefik
all versions
 no fix listed
go github.com/traefik/traefik/v2
all versions
 no fix listed

Affected products

  • traefik traefik
  • Red Hat Red Hat OpenShift Dev Spaces 3.27

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.