CVE-2026-41263
Traefik: A timing side-channel vulnerability allows for valid username enumeration via BasicAuth middleware in github.com/traefik/traefik
3.7
LOW
CVSS 3.1
EPSS 0.37%
Description
Traefik: A timing side-channel vulnerability allows for valid username enumeration via BasicAuth middleware in github.com/traefik/traefik
How to fix CVE-2026-41263
To remediate CVE-2026-41263, upgrade the affected package to a fixed version below.
- Go/github.com/traefik/traefik—no fix listed
- —no fix listed
- —upgrade to 2.11.43 or later
- —upgrade to 2.11.43 or later
- —upgrade to 3.7.0-rc.2 or later
- —upgrade to 3.6.14 or later
Is CVE-2026-41263 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- from 0, <= 1.7.34
- from 0
- from 0, < 2.11.43
- from 0, < 2.11.43
- >= 3.7.0-ea.1, < 3.7.0-rc.2
- >= 3.0.0-beta1, < 3.6.14, >= 3.7.0-ea.1, < 3.7.0-rc.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N |
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |