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CVE-2026-100833— Contrast before 1.23.1 Image Substitution via Policy Generation

Quick assessment

Affected
edgelesssys contrast
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Contrast（edgelesssys/contrast）在 1.14.0 至 1.23.1 版本（不含 1.23.1）中生成的运行时策略未能检测所有容器镜像替换行为。在 Kata Containers 的一次更新中，由于错误的 rebase 操作，意外引入了一条 规则，该规则允许使用 驱动程序的存储条目，且未验证镜像摘要（image digest）。因此，在 Contrast 的威胁模型中，例如拥有 Kata 代理 API 访问权限的 Kubernetes 集群管理员，若能确保被替换的镜像满足其余策略规则的要求

CVSS 8.2 · High EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1608.004 · Drive-by Target
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I. Basic Information for CVE-2026-100833

Vulnerability Information
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Vulnerability Title
Contrast before 1.23.1 Image Substitution via Policy Generation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
edgelesssys contrast 1.14.0 ~ 1.23.1 -

II. Public POCs for CVE-2026-100833

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III. Intelligence Information for CVE-2026-100833

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Vendor Advisories for CVE-2026-100833 (1)

Other References for CVE-2026-100833 (1)

Same Patch Batch · edgelesssys · 2026-09-27 · 11 CVEs total

CVE-2026-100839 8.4 HIGH Contrast before 1.18.0 AML Injection Remote Code Execution
CVE-2026-100838 8.1 HIGH Contrast before 1.19.1 CopyFile Policy Symlink Subversion
CVE-2026-100835 7.4 HIGH Contrast before 1.16.0 Remote Attestation Relay Attack
CVE-2025-71425 7.3 HIGH Contrast before 1.8.1 Information Disclosure via Logging
CVE-2025-71423 7.3 HIGH Edgelesssys Contrast before 1.12.2 Workload Secrets Information Disclosure
CVE-2025-71426 7.1 HIGH Contrast before 1.4.1 Coordinator Impersonation via Unauthenticated Recovery
CVE-2025-71422 5.7 MEDIUM Contrast before 1.12.1 Insecure LUKS2 Persistent Storage
CVE-2026-100836 4.3 MEDIUM Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer
CVE-2026-100837 3.7 LOW Edgeless Systems Contrast through 1.20.0 Credential Leak via Registry Suffix Matching
CVE-2025-71424 3.5 LOW Edgeless Systems Contrast before 1.9.1 Insecure Volume Mount

IV. Related Vulnerabilities

Same product: contrast
Same vendor: edgelesssys
Same weakness: CWE-20

V. Comments for CVE-2026-100833

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