# GO-2026-5709 - Crossplane: Signature verification TOCTOU allows installing unverified package content via mutable tag…

Source: https://junglewise.ai/threats/go-2026-5709-crossplane-signature-verification-toctou-allows-installing-e7dcc794  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25  
License: CC BY 4.0 with a link back

Severity: info · Published 2026-06-25

Crossplane: Signature verification TOCTOU allows installing unverified package content via mutable tag in github.com/crossplane/crossplane

Technologies: [github.com/crossplane/crossplane (Go)](https://junglewise.ai/threats/technologies/github-com-crossplane-crossplane). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Informational severity, published 25 June 2026.

**Which products and versions are affected?** github.com/crossplane/crossplane (Go) SEMVER:introduced=0; github.com/crossplane/crossplane/v2 (Go) SEMVER:introduced=2.3.0-rc.0.

**Is there a fix for This vulnerability?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected?** Check whether you run github.com/crossplane/crossplane (Go) or github.com/crossplane/crossplane/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- github.com/crossplane/crossplane (Go) SEMVER:introduced=0
- github.com/crossplane/crossplane/v2 (Go) SEMVER:introduced=2.3.0-rc.0

## Related threats

- [GO-2024-3219 - github.com/crossplane/crossplane: Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses](https://junglewise.ai/threats/go-2024-3219-github-com-crossplane-crossplane-unexpected-behavior-from-a683c43c)
- [github.com/crossplane/crossplane: Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses](https://junglewise.ai/threats/github-com-crossplane-crossplane-unexpected-behavior-from-is-methods-0a55b214)
- [GO-2023-1980 - Possible image tampering from missing image validation for Packages in github.com/crossplane/crossplane](https://junglewise.ai/threats/cve-2023-38495-possible-image-tampering-from-missing-image-validation-for)
- [GO-2023-1979 - Denial of service from large image in github.com/crossplane/crossplane](https://junglewise.ai/threats/cve-2023-37900-denial-of-service-from-large-image)
- [Crossplane-runtime contains Improper Input Validation via Compositions](https://junglewise.ai/threats/cve-2023-27484-crossplane-runtime-contains-improper-input-validation-via)