Cyber Resilience

CVE-2026-32595

Traefik ≤ 2.11.41

Published
20 March 2026
Modified
24 March 2026
Patch / advisory
View advisory
CVSS Score v4 6.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/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
EPSS Score 0.0039 31th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-32595 is a medium-severity Observable Timing Discrepancy (CWE-208) vulnerability in Traefik Traefik. Its CVSS base score is 6.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Brute Force (T1110); ranked at the 31th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and IA-6 (Authentication Feedback) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 comtain BasicAuth middleware that allows username enumeration via a timing attack. When a submitted username exists, the middleware performs a bcrypt password…

more

comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.

CWE(s)
CWE-208

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1110 Brute Force Credential Access
Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.
attack.mitre.org →
T1110.001 Password Guessing Credential Access
Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts.
attack.mitre.org →
T1110.003 Password Spraying Credential Access
Adversaries may use a single or small list of commonly used passwords against many different accounts to attempt to acquire valid account credentials.
attack.mitre.org →
Why these techniques?

Timing-based username enumeration directly aids password guessing/spraying (T1110 and subtechniques) by identifying valid accounts prior to brute-force attempts.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-41263Same product: Traefik Traefik
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CVE-2026-22045Same product: Traefik Traefik
CVE-2026-41181Same product: Traefik Traefik
CVE-2026-32695Same product: Traefik Traefik
CVE-2026-54762Same product: Traefik Traefik
CVE-2026-53622Same product: Traefik Traefik
CVE-2025-54386Same product: Traefik Traefik
CVE-2026-25949Same product: Traefik Traefik
CVE-2024-28869Same product: Traefik Traefik

Affected Assets

traefik
traefik
3.7.0 · ≤ 2.11.41 · 3.0.0 — 3.6.11

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • IA-6 Authentication Feedback
  • AC-3 Access Enforcement
  • SC-8 Transmission Confidentiality and Integrity
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V11.2.4

Mitigating Controls (NIST 800-53 r5) AI

IA-6 Authentication Feedback good match
prevent

Directly limits authentication feedback so that timing or other observable differences cannot be used to distinguish valid from invalid usernames.

AC-3 Access Enforcement good match
prevent

Requires that access enforcement decisions (here the BasicAuth check) be performed without leaking information via side channels such as response timing.

SC-8 Transmission Confidentiality and Integrity partial match
prevent

Mandates cryptographic protection of authentication traffic, which can be combined with constant-time implementations to reduce network-observable timing differences.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require constant-time implementations that eliminate observable timing discrepancies.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.17 Clock synchronization none match
none

Consistent reference clocks limit the attacker's ability to measure or manipulate timing differences that could reveal internal state or processing paths.

References