CVE-2026-100835 Contrast before 1.16.0 Remote Attestation Relay Attack
Attackers can bypass remote attestation by relaying valid reports from compromised hardware, impersonating trusted components in Contrast's attested TLS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100835?
CVE-2026-100835 is a critical vulnerability in edgelesssys contrast, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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).
Weakness: CWE-295
Which versions are affected by CVE-2026-100835?
How do I fix CVE-2026-100835?
No fix has been published for CVE-2026-100835 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-100835 being exploited?
There is no known exploitation of CVE-2026-100835 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-hjgc-jc5v-fw7h, GHSA-jw33-f4wc-8736.