TI-2026-64973 Aliases CVE-2026-100835 GHSA-jw33-f4wc-8736

Contrast before 1.16.0 Remote Attestation Relay Attack

MEDIUM 41CWE-295Published 2026-09-27 · Updated 2026-09-30

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

Contrast before 1.16.0 is susceptible to remote attestation relay attacks. Contrast accepted any TEE attestation report that verified correctly and contained the expected firmware patch levels and software measurements, regardless of which machine produced it, so attestation was not bound to specific, physically trusted hardware. An attacker who can both intercept network traffic between the CLI and the Coordinator (or between the Coordinator and an attested component) and forge reports or extract secrets from any single TEE machine under their physical control can relay such a report to impersonate a Contrast Coordinator or a Contrast workload, defeating identity verification in Contrast's attested TLS (aTLS).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00274 19th percentileScored 2026-11-07

Fix Fixed contrast (edgelesssys): 1.16.0

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	before 1.16.0	1.16.0	Patch available	CNA

contrast Vendoredgelesssys Affected before 1.16.0 Fixed in 1.16.0 Patch available CNA

Remediation

Fix · CNA contrast (edgelesssys) Fixed in 1.16.0

Timeline

2026-10-02 Threatist record created from CVE-2026-100835
2026-10-03 Alias added: GHSA-jw33-f4wc-8736

References

Advisory 1

GitHub Security Advisory (GHSA-hjgc-jc5v-fw7h)

TI-2026-64974 Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer CVSS 4.0MEDIUM 5.3
TI-2026-64976 Contrast before 1.19.1 CopyFile Policy Symlink Subversion CVSS 4.0HIGH 8.6
TI-2026-64971 Contrast before 1.23.1 Image Substitution via Policy Generation 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