# Edgeless Systems Contrast credential leak via unanchored suffix matching in Imagepuller

Source: https://junglewise.ai/threats/edgeless-systems-contrast-credential-leak-via-unanchored-suffix-9d4532bc  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-01. Updated: 2026-07-01  
License: CC BY 4.0 with a link back

Severity: low · CVSS 3.7 · Published 2026-07-01

Edgeless Systems Contrast, a tool for confidential computing, contains a flaw in how it identifies container registries. This vulnerability could allow an attacker to trick the system into sending sensitive login credentials or security configurations to a malicious server that mimics a trusted registry's name. While this could lead to the theft of registry passwords, it does not allow an attacker to modify the software being downloaded.

Technologies: [Edgeless Systems Contrast](https://junglewise.ai/threats/technologies/contrast), [github.com/edgelesssys/contrast (Go)](https://junglewise.ai/threats/technologies/github-com-edgelesssys-contrast). Vendors: [Edgeless Systems](https://junglewise.ai/threats/vendors/edgeless-systems), [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?** Low severity, with a CVSS score of 3.7, published 1 July 2026.

**Which products and versions are affected?** Edgeless Systems Contrast <= 1.20.0; github.com/edgelesssys/contrast (Go) <= 1.20.0.

**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.

**How is This vulnerability attacked?** It is attacked over the network, in a software library.

**Am I affected?** Check whether you run Edgeless Systems Contrast or github.com/edgelesssys/contrast (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.

## Technical details

The `Config.registryFor` function in the Contrast Imagepuller component incorrectly identifies registries using unanchored suffix matching via `strings.HasSuffix`. Because the match does not enforce a boundary (like a dot) between the configured FQDN and the request hostname, a configuration for a trusted registry like 'ghcr.io' would also match an attacker-controlled domain like 'evilghcr.io'. If a pull request is directed to such a sibling domain, the Imagepuller will leak the configured Authorization headers, trust custom CA bundles, or apply 'insecure-skip-verify' settings intended for the trusted registry. The vulnerability is mitigated by the fact that image integrity is still verified by digest, preventing code injection. A fix is available in version 1.21.0 which implements exact label matching.

## Affected products

- Edgeless Systems Contrast <= 1.20.0

## Timeline

- 2026-05-27: disclosed
- 2026-07-01: advisory: Published to GitHub Advisory Database

## References

- [https://api.github.com/users/offset](https://api.github.com/users/offset)
- [https://github.com/offset](https://github.com/offset)
- [https://api.github.com/users/offset/gists%7B/gist_id%7D](https://api.github.com/users/offset/gists%7B/gist_id%7D)
- [https://api.github.com/users/offset/repos](https://api.github.com/users/offset/repos)
- [https://avatars.githubusercontent.com/u/114768995?v=4](https://avatars.githubusercontent.com/u/114768995?v=4)
- [https://api.github.com/users/offset/events%7B/privacy%7D](https://api.github.com/users/offset/events%7B/privacy%7D)

## Related threats

- [Contrast improper verification in Coordinator peer recovery](https://junglewise.ai/threats/cve-2026-109359-contrast-1-8-0-before-1-24-1-contains-an-improper-verification)
- [Edgeless Systems Contrast privilege escalation in node installer](https://junglewise.ai/threats/cve-2026-109358-edgeless-systems-contrast-1-8-0-before-1-24-1-contains-an)
- [Edgeless Systems Contrast AML injection in ACPI handler](https://junglewise.ai/threats/cve-2026-100839-contrast-is-a-confidential-computing-runtime-for-kubernetes-in)
- [Edgeless Systems Contrast arbitrary filesystem write in CopyFile policy](https://junglewise.ai/threats/cve-2026-100838-contrast-is-a-confidential-computing-runtime-for-kubernetes-in)
- [Edgeless Systems Contrast panic in ciphertextContainer.UnmarshalJSON](https://junglewise.ai/threats/cve-2026-100836-contrast-through-1-20-0-contains-a-panic-vulnerability-in-the)