Improper Validation of Syntactic Correctness of Input Affecting kube-fluentd-operator package, versions <1.18.2-r67


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.19% (10th percentile)

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  • Snyk IDSNYK-WOLFILATEST-KUBEFLUENTDOPERATOR-17254071
  • published9 Jun 2026
  • disclosed2 Apr 2026

Introduced: 2 Apr 2026

CVE-2026-34835  (opens in a new tab)
CWE-1286  (opens in a new tab)

How to fix?

Upgrade Wolfi kube-fluentd-operator to version 1.18.2-r67 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kube-fluentd-operator package and not the kube-fluentd-operator package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Request parses the Host header using an AUTHORITY regular expression that accepts characters not permitted in RFC-compliant hostnames, including /, ?, #, and @. Because req.host returns the full parsed value, applications that validate hosts using naive prefix or suffix checks can be bypassed. This can lead to host header poisoning in applications that use req.host, req.url, or req.base_url for link generation, redirects, or origin validation. This issue has been patched in versions 3.1.21 and 3.2.6.

CVSS Base Scores

version 3.1