Improper input validation in Edgelesssys Contrast
CVE-2026-100833
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/edgelesssys/contrast/security/advisories/GHSA-m2qg-wrxv-h898 (vendor-advisory)
- www.vulncheck.com/advisories/contrast-before-1.23.1-image-substitution-via-poli… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100833?
- CVE-2026-100833 is a high-severity vulnerability in Edgelesssys Contrast, classified under Improper Input Validation. CVSS score: 8.2/10. Published 2026-09-27.
- How severe is CVE-2026-100833?
- High severity. CVSS v3 base score is 8.2 out of 10.