CVE-2026-32695
published 2026-03-27CVE-2026-32695: Traefik is an HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating…
PriorityP348high7.7CVSS 3.1
AVNACLPRLUINSCCHINAN
EPSS
0.46%
36.7th percentile
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating user-controlled values into backtick-delimited rule expressions without escaping. In live cluster validation, Knative `rules[].hosts[]` was exploitable for host restriction bypass (for example `tenant.example.com`) || Host(`attacker.com`), producing a router that serves attacker-controlled hosts. Knative `headers[].exact` also allows rule-syntax injection and proves unsafe rule construction. In multi-tenant clusters, this can route unauthorized traffic to victim services and lead to cross-tenant traffic exposure. Versions 3.6.11 and 3.7.0-ea.2 patch the issue.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| github.com | traefik_traefik_v2 | 0 – 2.11.42 | — |
| github.com | traefik_traefik_v3 | >= 0 < 3.6.11 | 3.6.11 |
| github.com | traefik_traefik_v3 | >= 3.7.0-ea.1 < 3.7.0-ea.2 | 3.7.0-ea.2 |
| traefik | traefik | < 3.6.11 | 3.6.11 |
| traefik | traefik | — | — |
| traefik | traefik | — | — |
CVSS provenance
nvdv3.17.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
nvdv4.06.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat6.3MEDIUM
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OSV
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass in github.com/traefik/traefik
osv·2026-04-02
CVE-2026-32695 Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass in github.com/traefik/traefik
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass in github.com/traefik/traefik
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass in github.com/traefik/traefik
GHSA
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
ghsa·2026-03-27
CVE-2026-32695 [MEDIUM] CWE-74 Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
## Summary
There is a potential vulnerability in Traefik's Kubernetes Knative, Ingress, and Ingress-NGINX providers related to rule injection.
User-controlled values are interpolated into backtick-delimited Traefik router rule expressions without escaping or validation. A malicious value containing a backtick can terminate the literal and inject additional operators into Traefik's rule language, altering the parsed rule tree. In shared or multi-tenant deployments, this can bypass host and header routing constraints and redirect unauthorized traffic to victim services.
## Patches
- https://github.com/traefik/traefik/releases/tag/v3.6.11
- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2
## For mo
OSV
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
osv·2026-03-27
CVE-2026-32695 [MEDIUM] Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
Traefik has Knative Ingress Rule Injection that Allows Host Restriction Bypass
## Summary
There is a potential vulnerability in Traefik's Kubernetes Knative, Ingress, and Ingress-NGINX providers related to rule injection.
User-controlled values are interpolated into backtick-delimited Traefik router rule expressions without escaping or validation. A malicious value containing a backtick can terminate the literal and inject additional operators into Traefik's rule language, altering the parsed rule tree. In shared or multi-tenant deployments, this can bypass host and header routing constraints and redirect unauthorized traffic to victim services.
## Patches
- https://github.com/traefik/traefik/releases/tag/v3.6.11
- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2
## For mo
Red Hat
github.com/traefik/traefik: Traefik: Cross-tenant traffic exposure and host restriction bypass via rule-syntax injection in Knative provider
vendor_redhat·2026-03-27·CVSS 6.3
CVE-2026-32695 [MEDIUM] CWE-917 github.com/traefik/traefik: Traefik: Cross-tenant traffic exposure and host restriction bypass via rule-syntax injection in Knative provider
github.com/traefik/traefik: Traefik: Cross-tenant traffic exposure and host restriction bypass via rule-syntax injection in Knative provider
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating user-controlled values into backtick-delimited rule expressions without escaping. In live cluster validation, Knative `rules[].hosts[]` was exploitable for host restriction bypass (for example `tenant.example.com`) || Host(`attacker.com`), producing a router that serves attacker-controlled hosts. Knative `headers[].exact` also allows rule-syntax injection and proves unsafe rule construction. In multi-tenant clusters, this can route unauthorized traffic to victim services and lead to cross-tenant
No detection rules found.
No public exploits indexed.
https://github.com/traefik/traefik/releases/tag/v3.6.11https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2https://github.com/traefik/traefik/security/advisories/GHSA-67jx-r9pv-98rjhttps://access.redhat.com/errata/RHSA-2026:10175https://access.redhat.com/security/cve/CVE-2026-32695https://bugzilla.redhat.com/show_bug.cgi?id=2452235https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32695.json
2026-03-27
Published