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CVE-2026-100837— Edgeless Systems Contrast through 1.20.0 Credential Leak via Registry Suffix Matching

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（Edgeless Systems 公司旗下产品）在 1.20.0 及更早版本中，在 imagepuller（镜像拉取器）选择每注册表（per-registry）配置时，使用了未锚定的后缀匹配逻辑。具体而言，Config.registryFor 函数仅剥离一个末尾的点号（ ），然后调用 strings.HasSuffix(hostname, fqdn) 进行后缀匹配，但未要求 DNS 标签边界。因此，例如 [registries."ghcr.io."] 这样的注册表配置条目，不仅适用于 ghcr.i

CVSS 3.7 · Low EPSS 0.21% · P10
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I. Basic Information for CVE-2026-100837

Vulnerability Information
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Vulnerability Title
Edgeless Systems Contrast through 1.20.0 Credential Leak via Registry Suffix Matching
Source: CVE Program / CVE List V5
Vulnerability Description
Contrast (Edgeless Systems) through 1.20.0 performs unanchored suffix matching when selecting per-registry configuration in the imagepuller. Config.registryFor strips a single trailing dot and then uses strings.HasSuffix(hostname, fqdn) without requiring a DNS label boundary, so a registry entry such as [registries."ghcr.io."] is also applied to any host whose name merely ends in that byte sequence, including attacker-registered domains such as evilghcr.io. When an image or layer is pulled from such a sibling domain, the imagepuller sends the configured Authorization header (basic auth, registry token, or identity token), trusts the configured custom CA bundle, follows the configured mirror, and honours insecure-skip-verify (disabling TLS verification) for that host. Image integrity is not affected, as image bytes remain pinned by digest in the policy and are validated after the pull. Configurations that use a leading dot (e.g., [registries.".example.registry"]) are unaffected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1289
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
edgelesssys contrast 0 ~ 1.20.0 -

II. Public POCs for CVE-2026-100837

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III. Intelligence Information for CVE-2026-100837

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Vendor Advisories for CVE-2026-100837 (1)

Other References for CVE-2026-100837 (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-2026-100833 8.2 HIGH Contrast before 1.23.1 Image Substitution via Policy Generation
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-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-1289

V. Comments for CVE-2026-100837

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