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CVE-2026-85597

9.1 CRITICALPublic exploitEPSS 0.23%
  1. Published4 Sept 2026

Description

Traefik before v2.11.55 and v3.0.0 through v3.7.10 contain a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting shared TLS resolution across multiple hostnames in a single router rule, causing the strict mTLS requirement to fall back to default options for all hosts.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Traefik Traefik≥ 3.0.0 < 3.7.11 · < 2.11.55

Remediation

Fixed in
Traefik Traefik≥ 3.7.11

References

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Frequently asked

Is CVE-2026-85597 being actively exploited?

CVE-2026-85597 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.23%.

How severe is CVE-2026-85597?

CVE-2026-85597 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.23% probability of exploitation.

Which products are affected by CVE-2026-85597?

Affected products include Traefik Traefik.

How do I fix CVE-2026-85597?

Upgrade affected software to a fixed version, for example Traefik Traefik 3.7.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-85597 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.