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CVE-2026-88010— Traefik: BasicAuth singleflight coalescing reintroduces an unauthenticated username-enumeration timing oracle

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.7.13, checkPassword in pkg/middlewares/auth/basic_auth.go constructs the BasicAuth singleflight key from the submitted password and stored secret. Concurrent requests for absen

CVSS 6.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
traefik traefik >= 3.6.11, < 3.7.13 affected
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I. Basic Information for CVE-2026-88010

Vulnerability Information

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Vulnerability Title
Traefik: BasicAuth singleflight coalescing reintroduces an unauthenticated username-enumeration timing oracle
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.7.13, checkPassword in pkg/middlewares/auth/basic_auth.go constructs the BasicAuth singleflight key from the submitted password and stored secret. Concurrent requests for absent usernames therefore coalesce on one key while configured usernames perform separate password hashes, creating an unauthenticated timing discrepancy that reveals whether a username exists. Sequential checks remain cost-equalized, Traefik v2 and Digest authentication are not affected, and the issue does not disclose credentials or bypass authentication. This issue is fixed in version 3.7.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik >= 3.6.11, < 3.7.13 -

II. Public POCs for CVE-2026-88010

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III. Intelligence Information for CVE-2026-88010

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Patches & Fixes for CVE-2026-88010 (2)

Vendor Pages for CVE-2026-88010 (1)

Other References for CVE-2026-88010 (1)

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-208

V. Comments for CVE-2026-88010

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