CVE-2026-32695Public exploitNetwork attack vector

Host restriction bypass via unescaped Knative rule values

Published Mar 27, 2026 · Updated Mar 27, 2026

Rule injection in Traefik Proxy before 3.6.11 and 3.7.0-ea.1 allows remote authenticated users to bypass host routing restrictions. The Knative provider inserts rules[].hosts[] and headers[].exact strings into backtick-delimited router expressions without escaping, so a backtick closes the literal and injects operators. Exploitation requires permission to create or update Knative Ingress resources with the experimental provider enabled, and successful host injection exposes victim services across tenant boundaries.

CVSS severity6.3
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Rule injection in Traefik Proxy before 3.6.11 and 3.7.0-ea.1 allows remote authenticated users to bypass host routing restrictions. The Knative provider inserts rules[].hosts[] and headers[].exact strings into backtick-delimited router expressions without escaping, so a backtick closes the literal and injects operators. Exploitation requires permission to create or update Knative Ingress resources with the experimental provider enabled, and successful host injection exposes victim services across tenant boundaries.

The record

CVE
CVE-2026-32695
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Traefik Labs
Product
Traefik Proxy
Classifications
CWE-917, CWE-74, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.6.11
  2. Affected versionversion=>= 3.7.0-ea.1, < 3.7.0-ea.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Traefik Labs · Traefik Proxyversion=< 3.6.11; version=>= 3.7.0-ea.1, < 3.7.0-ea.2

Published CVSS scores

7.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
7.7redhat-SADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
6.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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