Traefik is a widely used cloud-native reverse proxy/ingress; this bug enables auth and routing bypass across virtual hosts, risking large-scale service compromise in many orgs.
CVE-2026-88009
Traefik path-handling flaw enables cross-vhost routing and auth bypass.
Is CVE-2026-88009 being exploited?
Not confirmed. CVE-2026-88009 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-88009?
CVE-2026-88009 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88009?
Yes. A fix has been recorded for CVE-2026-88009. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88009 affect?
CVE-2026-88009 affects Traefik < 2.11.57 (v2.x), Traefik < 3.7.13 (v3.x), Traefik HTTP reverse proxy/load balancer. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88009?
Upgrade Traefik to 2.11.57 or 3.7.13 immediately; restrict ingress and review access logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Cross-vhost routing and path-scoped auth bypass; attackers can reach unauthorized backends, evade access logs, and potentially trigger RCE on vulnerable backends.
Immediate action required
- affected< 2.11.57
- affected>= 3.0.0 and < 3.7.13
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.