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 · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (14.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- GitHub Security Advisory (GHSA-m2qg-wrxv-h898) (vendor-advisory)
- VulnCheck Advisory: Contrast before 1.23.1 Image Substitution via Policy Generation (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100833?
- CVE-2026-100833 is a critical-severity vulnerability in Edgelesssys Contrast, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-09-27.
- How severe is CVE-2026-100833?
- Critical severity. CVSS v3 base score is 9.6 out of 10.
- Is CVE-2026-100833 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.