TI-2026-64971 Aliases CVE-2026-100833 GHSA-mjj6-px65-jq92

Contrast before 1.23.1 Image Substitution via Policy Generation

LOW 39CWE-20Published 2026-09-27 · Updated 2026-10-09

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Contrast (edgelesssys/contrast) versions 1.14.0 before 1.23.1 generate runtime policies that fail to detect all container image substitutions. A bad rebase during a Kata Containers update accidentally introduced an `allow_storage` rule that accepts storage entries using the `image_guest_pull` driver without verifying the image digest. An attacker with access to the Kata agent API — for example, a Kubernetes cluster administrator in Contrast's threat model — can therefore substitute a container image with an exploit payload, provided the substituted image satisfies the remaining policy rules, undermining the confidential container's integrity guarantees.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00234 14th percentileScored 2026-11-07

Fix Fixed contrast (edgelesssys): 1.23.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
edgelesssys	contrast	1.14.0 to before 1.23.1	1.23.1	Patch available	CNA

contrast Vendoredgelesssys Affected 1.14.0 to before 1.23.1 Fixed in 1.23.1 Patch available CNA

Remediation

Fix · CNA contrast (edgelesssys) Fixed in 1.23.1

Timeline

2026-10-02 Threatist record created from CVE-2026-100833
2026-10-03 Alias added: GHSA-mjj6-px65-jq92
2026-10-09 CVSS score changed · CNA

References

Advisory 1

GitHub Security Advisory (GHSA-m2qg-wrxv-h898)

TI-2026-64974 Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer CVSS 4.0MEDIUM 5.3
TI-2026-64973 Contrast before 1.16.0 Remote Attestation Relay Attack CVSS 4.0CRITICAL 9.1
TI-2026-64976 Contrast before 1.19.1 CopyFile Policy Symlink Subversion CVSS 4.0HIGH 8.6
TI-2026-71174 Contrast world-writable containerd config allows privilege escalation CVSS 4.0HIGH 8.5
TI-2025-43536 Contrast before 1.8.1 Information Disclosure via Logging CVSS 4.0HIGH 8.5
TI-2025-43534 Edgelesssys Contrast before 1.12.2 Workload Secrets Information Disclosure CVSS 4.0HIGH 8.5

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences