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CVE-2026-100836— Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer

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 1.20.0 版本中，transit-engine 端点的 ciphertextContainer.UnmarshalJSON 函数存在一个恐慌（panic）漏洞。该函数在切片操作前未对解码后的密文长度进行验证。拥有有效 mesh 证书并已认证的客户端（workload）可通过提交一个过短的 base64 编码密文触发运行时恐慌，导致日志大量输出（log spam）和请求失败，但不会导致进程崩溃。

CVSS 4.3 · Medium EPSS 0.15% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-100836

Vulnerability Information
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Vulnerability Title
Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer
Source: CVE Program / CVE List V5
Vulnerability Description
Contrast through 1.20.0 contains a panic vulnerability in the transit-engine endpoint's ciphertextContainer.UnmarshalJSON function that fails to validate decoded ciphertext length before slicing. An authenticated workload with a valid mesh certificate can trigger a runtime panic by submitting a short base64-encoded ciphertext, causing log spam and request failures without crashing the process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
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-2026-100836

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III. Intelligence Information for CVE-2026-100836

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Vendor Advisories for CVE-2026-100836 (1)

Other References for CVE-2026-100836 (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-2026-100837 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-129

V. Comments for CVE-2026-100836

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