What is the CVSS score of CVE-2026-32595?

CVE-2026-32595 has a CVSS 3.1 base score of 3.7 (Low). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Traefik are affected by CVE-2026-32595?

CVE-2026-32595 is a low-severity vulnerability in Traefik (CVSS 3.7). The limited severity suggests constrained impact, typically requiring specific conditions or local access for exploitation.. A patch is available.

How to fix or mitigate CVE-2026-32595?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Traefik CVE-2026-32595

EUVD-2026-13664 LOW

Observable Timing Discrepancy (CWE-208)

2026-03-20 GitHub_M

GHSA-g3hg-j4jv-cwfr

Information Disclosure Traefik

3.7

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

3.7 LOW

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

EUVD ID Assigned

Mar 20, 2026 - 11:00 euvd

EUVD-2026-13664

Analysis Generated

Mar 20, 2026 - 11:00 vuln.today

CVE Published

Mar 20, 2026 - 10:08 nvd

LOW 3.7

DescriptionGitHub Advisory

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 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.

AnalysisAI

Traefik's BasicAuth middleware contains a timing attack vulnerability that enables username enumeration through observable response time differences between valid and invalid usernames. An unauthenticated network attacker can distinguish existing usernames from non-existent ones by measuring response latency-valid usernames trigger ~166ms bcrypt operations while invalid usernames return in ~0.6ms, creating a ~298x timing differential. Affected versions include Traefik 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1; patches are available in versions 2.11.41, 3.6.11, and 3.7.0-ea.2.

Technical ContextAI

This vulnerability exploits timing side-channels in cryptographic implementations, specifically classified under CWE-208 (Observable Timing Discrepancy). Traefik's BasicAuth middleware (cpe:2.3:a:traefik:traefik) implements HTTP Basic Authentication using bcrypt password hashing. The root cause stems from an optimization where the middleware returns immediately upon detecting a non-existent username without performing the expensive bcrypt comparison operation that occurs for valid usernames. This conditional execution pattern leaks information about user database membership through measurable network latency differences. The attack is feasible because bcrypt's intentionally slow design (~166ms) creates a large enough timing gap to be reliably detected over standard network connections, even with inherent latency noise.

RemediationAI

Immediately upgrade Traefik to version 2.11.41 (for 2.x deployments), 3.6.11 (for stable 3.x deployments), or 3.7.0-ea.2 or later (for early access branches). These patched versions implement constant-time username validation by performing bcrypt operations for all usernames—whether they exist or not—eliminating the observable timing differential. For organizations unable to patch immediately, implement network-level mitigations: restrict BasicAuth endpoints to trusted IP ranges via firewall rules or network access controls, deploy rate limiting on authentication endpoints to increase measurement difficulty and detection probability, and consider supplementing BasicAuth with additional authentication factors (mutual TLS, API keys) that are less susceptible to timing attacks. Review Traefik configuration to ensure BasicAuth is not unnecessarily exposed to untrusted networks. Consult the official security advisory at https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr for version-specific deployment guidance.