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8.4

Kubernetes Go modules can be tricked to load fake code

published 5 days ago
Summary

The Kubernetes software that uses Go modules could be fooled by a malicious proxy into accepting tampered code as genuine. This lets an attacker place their own code into the local module cache, bypassing built‑in integrity checks. Update to the latest Kubernetes release or configure trusted module sources to protect against this risk.

What to do
  • Update cleanstart kubernetes to version 1.36.3-r2.
Affected software
Ecosystem VendorProductAffected versions
CleanStart cleanstart kubernetes < 1.36.3-r2
Fix: upgrade to 1.36.3-r2
Original advisory text
malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go ...
Security vulnerability affects the kubernetes package. A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
8.4 High
Timeline
Published30 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2026-IY63295 · OSV
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