CVE Explorer
CVE-2026-41263
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"traefik","vendor":"traefik","versions":[{"status":"affected","version":"< 2.11.43"},{"status":"affected","version":">= 3.0.0-beta1, < 3.6.14"},{"status":"affected","version":">= 3.7.0-ea.1, < 3.7.0-rc.2"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:29a77b6e1189542a7bec1bf06060ea0e73e576ada5d2972fcc0d22ecf2806539 · sha256:3bd8016f4d9c6da6… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:29a77b6e1189542a7bec1bf06060ea0e73e576ada5d2972fcc0d22ecf2806539 · sha256:3bd8016f4d9c6da6… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-208","description":"CWE-208: Observable Timing Discrepancy","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:29a77b6e1189542a7bec1bf06060ea0e73e576ada5d2972fcc0d22ecf2806539 · sha256:3bd8016f4d9c6da6… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/traefik/traefik/releases/tag/v2.11.43","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v2.11.43"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:29a77b6e1189542a7bec1bf06060ea0e73e576ada5d2972fcc0d22ecf2806539 · sha256:3bd8016f4d9c6da6… · /containers/cna/references/1
{"name":"https://github.com/traefik/traefik/releases/tag/v3.6.14","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.6.14"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:29a77b6e1189542a7bec1bf06060ea0e73e576ada5d2972fcc0d22ecf2806539 · sha256:3bd8016f4d9c6da6… · /containers/cna/references/2
{"name":"https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2","tags":["x_refsource_MISC"],"url":"https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:29a77b6e1189542a7bec1bf06060ea0e73e576ada5d2972fcc0d22ecf2806539 · sha256:3bd8016f4d9c6da6… · /containers/cna/references/3
{"name":"https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-6x2q-h3cr-8j2h"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:29a77b6e1189542a7bec1bf06060ea0e73e576ada5d2972fcc0d22ecf2806539 · sha256:3bd8016f4d9c6da6… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.