by Kastro
Paper/Archive/CVE-2026-100833

CVE-2026-100833

edgelesssys contrast — Contrast before 1.23.1 Image Substitution via Policy Generation

EPSS 0.2%CVSS 9.6
critical.is priorityof 100
32
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 14.3.143 × 202.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
contrast1.14.0 – < 1.23.11.23.1CNA

Scores by source

VulnCheck (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
VulnCheck (CNA)8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorygithub.com/edgelesssys/contrast/security/advisories/GHSA-m2qg-wrxv-h898writeupvulncheck.com/advisories/contrast-before-1.23.1-image-substitution-via-policy-generation