46/100 CVSS 8.1 🔴 CVE ANALYSISPublished: April 30, 2026

Contras Affected by CopyFile Policy Subversion via Symlinks

### Impact The [Kata agent policies](https://docs.edgeless.systems/contrast/architecture/components/policies) generated by the Contrast CLI had an issue in the `CopyFile` verification, which allowed arbitrary writes to the guest root filesytem. A malicious process on the host with the capability to connect to the Kata agent VSOCK could connect to t...

8.1

CVSS Score

MEDIUM

Threat Level

Priority /100

TBD

Exploited ITW

Monitor

CISA Status

Sources

🔵

HIGH-PRIORITY SECURITY ADVISORY — Priority Score: 46/100

CVSS 8.1 MEDIUM. SENTINEL APEX recommends immediate patch evaluation. Intelligence from 1 confirmed source(s).

📋 Executive Summary

⚡ Analyst Assessment — SENTINEL APEX v4.0

This report analyzes GHSA-1a6c19de6eebcc00 affecting go github.com/edgelesssys/contrast. Composite threat score: 46/100. Intelligence corroborated across 1 source(s): github_advisories. CVSS base score: 8.1. No confirmed in-the-wild exploitation at the time of writing; prioritize on exposure, privilege, and CVSS.

Intelligence sources: github_advisories

⚠️ Business Impact Analysis

⚠️ go github.com/edgelesssys/contrast users face material security risk requiring immediate remediation

🔗 Representative Attack Path

A typical attack path for this vulnerability class, mapped to MITRE ATT&CK — a representative model to guide detection and defense, not a claim of observed activity against a specific target. Confirm specifics against the primary sources below.

#	Phase	Attacker Action	MITRE
1	Reconnaissance	Attacker identifies exposed github.com/edgelesssys/contrast instances via Shodan, Censys, or targeted scanning	`TA0043`
2	Initial Access	Exploitation of GHSA-1a6c19de6eebcc00 in go github.com/edgelesssys/contrast	`T1190`
3	Persistence	Backdoor, scheduled task, or new admin account created for persistent access	`T1053`
4	Command & Control	Attacker establishes persistent C2 channel using HTTPS or DNS tunneling	`T1071`
5	Impact / Objectives	Intellectual property theft, espionage, cryptomining, or preparation for future attack stage	`T1657`

⚠ Deep Dive Analysis

This high-severity vulnerability in go github.com/edgelesssys/contrast (CVSS 8.1) represents a significant attack surface. SENTINEL APEX assesses exploitation to be technically feasible with moderate effort. Organizations running github.com/edgelesssys/contrast in internet-facing or privileged positions face immediate risk.

SENTINEL APEX URGENCY: HIGH. Score: 46/100 MEDIUM. Patch before exploitation activity begins.

🎯 MITRE ATT&CK Mapping

Category	Mapping
Primary Tactic	Initial Access
Primary Technique	T1190 — Exploit Public-Facing Application
Sub-Technique	T1203 — Exploitation for Client Execution
Weakness (CWE)	CWE-59
Intel Type	🔴 CVE ANALYSIS
Source(s)	github_advisories

🏷️ Indicators of Compromise — Enriched IOC Feed

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Indicator Value	Type	Confidence	First Seen
https://docs.edgeless.systems/contrast/architecture/components/policies)	url	82%	2026-04-30

🔍 Detection Rules — Sigma (SIEM)

Deploy to Splunk, Elastic, Microsoft Sentinel, or QRadar. SOC Pro subscribers receive pre-compiled SIEM-native query packs updated with each pipeline run.

Sigma YAMLtitle: GHSA-1a6c19de6eebcc00 Exploitation Attempt — go github.com/edgelesssys/contrast
id: fdd9dabcdff005bc-b534
status: experimental
description: Detects exploitation of GHSA-1a6c19de6eebcc00 in go github.com/edgelesssys/contrast. Priority: MEDIUM. Score: 46/100
author: CYBERDUDEBIVASH SENTINEL APEX v4.0 (bivash@cyberdudebivash.com)
date: 2026-04-30
references:
    - https://nvd.nist.gov/vuln/detail/GHSA-1a6c19de6eebcc00
    - https://blog.cyberdudebivash.in/
tags:
    - attack.initial_access
    - attack.t1190
logsource:
    category: webserver
detection:
    keywords:
        - 'ghsa-1a6c19de6eebcc00'
    condition: keywords
falsepositives:
    - Security scanners
level: high

📡 Detection Rules — YARA (Endpoint)

Deploy to endpoint detection platforms. Enterprise subscribers receive tuned, FP-validated YARA rule packs.

YARArule GHSA_1a6c19de6eebcc00_Exploitation {
    meta:
        description = "Detects artifacts related to GHSA-1a6c19de6eebcc00 exploitation in go github.com/edgelesssys/contrast"
        author      = "CYBERDUDEBIVASH SENTINEL APEX v4.0"
        date        = "2026-04-30"
        severity    = "HIGH"
        cvss        = "8.1"
        priority    = "46/100"
        threat_level = "MEDIUM"
        reference   = "https://nvd.nist.gov/vuln/detail/GHSA-1a6c19de6eebcc00"
    strings:
        $id_str  = "GHSA-1a6c19de6eebcc00" ascii nocase
        $product = "github_com_edgelesssys_contrast" ascii nocase wide
    condition:
        any of them
}

🛡️ SOC Response Playbook

1IMMEDIATE (0-1hr): Identify all instances of github.com/edgelesssys/contrast in your environment via CMDB/asset inventory
2IMMEDIATE: Block all 1 IOCs in this report at firewall, proxy, DNS, and EDR simultaneously
3IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception for MEDIUM threats
4IMMEDIATE (1-2hr): If no patch available: implement WAF rules, ACLs, or network-level compensating controls
5SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation in test environment
6SHORT-TERM (4-8hr): Review logs for exploitation indicators (anomalous github.com/edgelesssys/contrast requests, error spikes)
7SHORT-TERM (8-24hr): Hunt for post-exploitation: new admin accounts, scheduled tasks, lateral movement
8MONITOR: Subscribe to go security advisories for patch updates
9ONGOING: Track SENTINEL APEX intelligence feed for follow-on campaigns targeting github.com/edgelesssys/contrast

📎 Intelligence References

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⚡ CYBERDUDEBIVASH SENTINEL APEX v4.0

Intelligence report generated by CYBERDUDEBIVASH SENTINEL APEX v4.0
Report ID: SENTINEL-GHSA-1a6c19de6eebcc00-2026-04-30 | Priority: 46/100 MEDIUM | Sources: 1
© 2026 CYBERDUDEBIVASH PRIVATE LIMITED
Republication requires written attribution to CYBERDUDEBIVASH SENTINEL APEX

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