9.8

CVE-2026-85595: Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth

Analyzed
AliasesCGA-4j94-vm5v-vwxwCGA-5556-6hjf-9j5m
Published 04-09-2026Last modified 08-10-2026

Vulnerability summary

CVE-2026-85595 is a critical (CVSS 9.8) Improper Authentication vulnerability in traefik. EPSS estimates a 2.45% chance of exploitation in the next 30 days, higher than 84.4% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
2.45%
0%100%
Low · +1.76 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Timeline

  1. 04-09-2026
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

2.45%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

Increase +1.76 pp

From 0.69% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Traefik

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard1 product
  • traefik-3.6All versions (No fix recorded)
Traefik1 product
  • traefik≥ 3.0.0, ≤ 3.7.10 | < 2.11.55 | ≥ 3.0.0, < 3.7.11
Wolfi1 product
  • traefik-3.6All versions (No fix recorded)

3 vendors · 3 products

References

4 links