PT-2026-36184 · Traefik · Traefik

Kodareef5 · Published 2026-04-24 · Updated 2026-05-05 · CVE-2026-41263

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Traefik versions prior to 2.11.43 Traefik versions prior to 3.6.14 Traefik versions prior to 3.7.0-rc.2

Description A timing side-channel issue exists in the BasicAuth middleware. A variable meant to provide a constant-time fallback secret consistently resolves to an empty string, which causes the constant-time comparison to short-circuit quickly instead of completing a full bcrypt evaluation. This creates a timing oracle, allowing an attacker to enumerate valid usernames by measuring differences in authentication response times.

Recommendations Update to version 2.11.43 Update to version 3.6.14 Update to version 3.7.0-rc.2

Fix

Weakness Enumeration

CWE-208

Related Identifiers

CVE-2026-41263

GHSA-6X2Q-H3CR-8J2H

OPENSUSE-SU-2026:10697-1

OPENSUSE-SU-2026:10698-1

Affected Products

Traefik

References · 17

• https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-41263 · Security Note
• https://osv.dev/vulnerability/GHSA-6x2q-h3cr-8j2h · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10698-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10697-1 · Vendor Advisory
• https://github.com/traefik/traefik/releases/tag/v2.11.43 · Note
• https://github.com/traefik/traefik/releases/tag/v3.6.14 · Note
• https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 · Note
• https://github.com/traefik/traefik · Note
• https://t.me/cveNotify/161785 · Telegram Post
• https://suse.com/security/cve/CVE-2026-35051 · Note
• https://suse.com/security/cve/CVE-2026-41174 · Note
• https://suse.com/security/cve/CVE-2026-34986 · Note
• https://suse.com/security/cve/CVE-2026-41263 · Note
• https://suse.com/security/cve/CVE-2026-40912 · Note