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critical vulnerability

Crossplane: Signature verification TOCTOU allows installing unverified package content via mutable tag

Partly patchedCritical · CVSS 9

Published Jun 19, 2026 · updated Sep 29, 2026

What to do

  1. Upgrade to a fixed version: github.com/crossplane/crossplane/v2 2.3.3, github.com/crossplane/crossplane/v2 2.2.3.
  2. Some affected packages have no fixed version yet: follow the advisory for mitigations and watch this page for the fix.
  3. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

Gogithub.com/crossplane/crossplane/v2

Vulnerable versions
>= 2.3.0-rc.0, <= 2.3.2
Fixed in
2.3.3

Check your project: go list -m all | grep github.com/crossplane/crossplane/v2

Gogithub.com/crossplane/crossplane/v2

Vulnerable versions
<= 2.2.2
Fixed in
2.2.3

Check your project: go list -m all | grep github.com/crossplane/crossplane/v2

Gogithub.com/crossplane/crossplane

Vulnerable versions
<= 1.21.0-rc.0
Fixed in
no fix yet

Check your project: go list -m all | grep github.com/crossplane/crossplane

Sources

CWE-345 Insufficient Verification of Data Authenticity · CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

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