Improper Input Validation Affecting butane package, versions <0:0.12.1-1.rhaos4.8.el8


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
1.33% (68th percentile)

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  • Snyk IDSNYK-RHEL8-BUTANE-18679160
  • published12 Aug 2026
  • disclosed18 May 2021

Introduced: 18 May 2021

CVE-2021-25737  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade RHEL:8 butane to version 0:0.12.1-1.rhaos4.8.el8 or higher.
This issue was patched in RHSA-2021:2437.

NVD Description

Note: Versions mentioned in the description apply only to the upstream butane package and not the butane package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.

CVSS Base Scores

version 3.1