CVE-2026-35051

Q: How do I fix CVE-2026-35051?

Upgrade traefik to 2.11.43 or later.

Q: Is CVE-2026-35051 being actively exploited?

Not that we know of. CVE-2026-35051 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.27% is the estimated probability that it will be exploited in the next 30 days. That is higher than 19% of all scored CVEs.

Q: How severe is CVE-2026-35051?

CVE-2026-35051 has a CVSS v3 base score of 10.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-35051 affect?

Published advisories record a fix for traefik (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICAL

10.0

CVSS v3

NVD

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

CWE-345 CWE-501

How to fix

Remediation Available

traefikNVD

Affected:< 2.11.43Fixed in:2.11.43CVE-2026-35051derived from NVD

Affected:>= 3.0.0, < 3.6.14Fixed in:3.6.14CVE-2026-35051derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

Patch1

github.com

Release Notes3

Other references4

Related Vulnerabilities

Other CWE-345 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-38831	High	7.8	100%	KEV + Ransom	Fix
CVE-2016-4553	High	8.6	80%	-	Fix
CVE-2016-4554	High	8.6	39%	-	Fix
CVE-2023-35719	Medium	6.8	25%	-	-
CVE-2022-26871	Critical	9.8	19%	KEV	-
CVE-2025-51471	Medium	6.9	19%	-	-

Common questions

How do I fix CVE-2026-35051?

Upgrade traefik to 2.11.43 or later.

Is CVE-2026-35051 being actively exploited?

Not that we know of. CVE-2026-35051 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.27% is the estimated probability that it will be exploited in the next 30 days. That is higher than 19% of all scored CVEs.

How severe is CVE-2026-35051?

CVE-2026-35051 has a CVSS v3 base score of 10.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-35051 affect?

Published advisories record a fix for traefik (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-35051

Markdown

[![CVE-2026-35051](https://tridentstack.com/cve/badge/CVE-2026-35051.svg)](https://tridentstack.com/cve/CVE-2026-35051)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-35051"><img src="https://tridentstack.com/cve/badge/CVE-2026-35051.svg" alt="CVE-2026-35051"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Run a free CVE scan on your fleet Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.