CVE-2026-34450

import os import tempfile # Simulating the vulnerable file creation logic in the SDK # The SDK creates memory files with mode 0o666 def create_vulnerable_memory_file(filename): # Create a file with mode 0o666 (rw-rw-rw-) fd = os.open(filename, os.O_RDWR | os.O_CREAT, 0o666) with os.fdopen(fd, 'w') as f: f.write('{"memory": "sensitive_agent_state"}') return filename # Setup a temporary directory for testing temp_dir = tempfile.mkdtemp() memory_file = os.path.join(temp_dir, "agent_memory.json") print(f"Creating file: {memory_file}") create_vulnerable_memory_file(memory_file) # Check the file permissions file_stat = os.stat(memory_file) octal_permissions = oct(file_stat.st_mode & 0o777) print(f"File permissions: {octal_permissions}") if octal_permissions == '0o666': print("[!] VULNERABLE: File is world-readable and world-writable.") print(" An attacker could read sensitive data or modify the agent's memory.") else: print("[+] SAFE: File permissions are restricted.") # Cleanup os.remove(memory_file) os.rmdir(temp_dir)

{"cve": {"id": "CVE-2026-34450", "sourceIdentifier": "[email protected]", "published": "2026-03-31T22:16:19.987", "lastModified": "2026-04-13T15:10:50.597", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, the local filesystem memory tool in the Anthropic Python SDK created memory files with mode 0o666, leaving them world-readable on systems with a standard umask and world-writable in environments with a permissive umask such as many Docker base images. A local attacker on a shared host could read persisted agent state, and in containerized deployments could modify memory files to influence subsequent model behavior. Both the synchronous and asynchronous memory tool implementations were affected. This issue has been patched in version 0.87.0."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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": 4.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "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:L/UI:N/S:U/C:L/I:L/A:N", "baseScore": 4.4, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-276"}, {"lang": "en", "value": "CWE-732"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:anthropic:claude_sdk_for_python:*:*:*:*:*:python:*:*", "versionStartIncluding": "0.86.0", "versionEndExcluding": "0.87.0", "matchCriteriaId": "F8729891-B554-4F1D-AD6B-EA089F7E6AB0"}]}]}], "references": [{"url": "https://github.com/anthropics/anthropic-sdk-python/commit/715030ceb4d6dd8d3546e999c680e29532bf1255", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-q5f5-3gjm-7mfm", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}