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Advisory record · GHSA-wfqx-gjrf-g28r

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

CVSS 9.0 CriticalCritical

Critical, because:

  • CVSS score 9.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 19 Jun 2026, 20:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/crossplane/crossplane/v2Go>=2.3.0-rc.0, <2.3.3 || <2.2.32.3.3, 2.2.3
github.com/crossplane/crossplaneGo<=1.21.0-rc.0No fixed version yet
Identifiers
GHSA-wfqx-gjrf-g28r · GO-2026-5709
Weakness (CWE)
CWE-345 · CWE-367
Tags
Published
19 Jun 2026
Updated
29 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Crossplane v2 versions before 2.2.3 and from 2.3.0-rc.0 before 2.3.3 are affected, as are Crossplane v1 releases up to and including 1.21.0-rc.0, for which no fixed version is listed. When signature verification is enabled and packages are installed by tag from a registry the user does not control, an attacker-controlled registry can serve a signed image for verification and an unsigned one for installation, so unverified content gets installed. Upgrade v2 installs to 2.2.3 or 2.3.3. Installing packages by image digest instead of tags avoids the issue.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.0 Critical 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.