Public proof of conceptFix available

CVE-2026-85595

Q: Is CVE-2026-85595 actively exploited?

Active exploitation of CVE-2026-85595 has not been confirmed. Its EPSS score was 2.5% on 2026-10-29, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-85595?

CVE-2026-85595 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2026-09-04
Fixed in3.7.11 · 2.11.55
WeaknessCWE-287

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Traefik versions before v2.11.55 and versions v3.0.0 through v3.7.10 contain an authentication bypass vulnerability in the digestAuth middleware where unknown usernames receive an empty secret instead of rejection. Attackers can compute a valid digest response using the empty secret and arbitrary credentials to bypass authentication on any digestAuth-protected route without a valid username or password.

Timeline

dates in UTC

2026-09-0412:17CVE publishedNVD
2026-10-2523:12First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-29 15:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-85595?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-85595?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Traefik

Branch	Affected	Fixed in	Source
3.x	≥ 3.0.0, < 3.7.11	3.7.11	NVD
2.11	< 2.11.55	2.11.55	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-85595 Red Hat Product Security1 known affected
github.com/traefik/traefik: Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
devspaces/traefik-rhel9 as a component of Red Hat OpenShift Dev Spaces

Full record on NVD

Fix

Update Traefik to 3.7.11 · 2.11.55
Workaround from the vendor Red Hat Product Security CVE-2026-85595 · 1 productDisable the digestAuth middleware and transition to alternative authentication mechanisms such as basicAuth, ForwardAuth, or mTLS. Alternatively, restrict network access to digestAuth-protected routes at an upstream gateway or network firewall until patched.
No fix available, says the vendor Red Hat Product Security CVE-2026-85595 · 1 productAffected

Advisories and patches

github.comMitigation · Patch · Vendor Advisory

Detection

read 2026-10-29 05:04 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedBoreas37/CVE-2026-85595-PoC

Sources

CISA-ADPSSVC decisionnone2026-09-04
OpenCVESSVC decisionnone—
CNACVSS 4.09.3read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score2.5 %2026-10-29
PoC-in-GitHubproof of concept1read 2026-10-29

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: 2026-09-04
Last Modified: 2026-10-08
NVD status: Analyzed

Frequently asked questions

What is CVE-2026-85595?

Is CVE-2026-85595 actively exploited?

Active exploitation of CVE-2026-85595 has not been confirmed. Its EPSS score was 2.5% on 2026-10-29, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-85595?

CVE-2026-85595 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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