CVE-2026-34450

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{"affected": [{"affectedData": [{"product": "anthropic-sdk-python", "vendor": "anthropics", "versions": [{"status": "affected", "version": ">= 0.86.0, < 0.87.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:anthropic:claude_sdk_for_python:*:*:*:*:*:python:*:*", "matchCriteriaId": "F8729891-B554-4F1D-AD6B-EA089F7E6AB0", "versionEndExcluding": "0.87.0", "versionStartIncluding": "0.86.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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."}, {"lang": "es", "value": "El SDK de Claude para Python proporciona acceso a la API de Claude desde aplicaciones Python. Desde la versi\u00f3n 0.86.0 hasta antes de la versi\u00f3n 0.87.0, la herramienta de memoria del sistema de archivos local en el SDK de Python de Anthropic creaba archivos de memoria con el modo 0o666, dej\u00e1ndolos legibles para todos en sistemas con un umask est\u00e1ndar y escribibles para todos en entornos con un umask permisivo, como muchas im\u00e1genes base de Docker. Un atacante local en un host compartido podr\u00eda leer el estado persistido del agente, y en despliegues contenerizados podr\u00eda modificar archivos de memoria para influir en el comportamiento posterior del modelo. Ambas implementaciones de la herramienta de memoria, tanto s\u00edncronas como as\u00edncronas, se vieron afectadas. Este problema ha sido parcheado en la versi\u00f3n 0.87.0."}], "id": "CVE-2026-34450", "lastModified": "2026-07-24T21:10:00.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 4.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34450", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-01T13:35:12.188726Z", "version": "2.0.3"}}]}, "published": "2026-03-31T22:16:19.987", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/anthropics/anthropic-sdk-python/commit/715030ceb4d6dd8d3546e999c680e29532bf1255"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-q5f5-3gjm-7mfm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-276"}, {"lang": "en", "value": "CWE-732"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.86.0,0.87.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "anthropic-sdk-python", "source": "cna", "vendor": "anthropics"}, "product": "anthropic-sdk-python", "vendor": "anthropics"}], "analysis": {"en": {"generated_at": "2026-04-13T16:31:57.710652+00:00", "value": {"mitigation_remediation": ["Upgrade the Anthropic Claude SDK for Python to version 0.87.0 or later.", "Remove any memory files that were created by older SDK versions and still have insecure 0666 permissions.", "Verify that any new memory files created by the updated SDK are created with restricted permissions."], "summary": {"action": "Apply Patch", "impact": "Local attacker can read or modify stored Claude agent state due to insecure file permissions"}, "threat_synthesis": {"affected_systems": "The vulnerability impacts the Anthropic Claude SDK for Python, affecting releases from version 0.86.0 up to, but not including, 0.87.0. Both the synchronous and asynchronous memory tool implementations exhibit the insecure behaviour. Python applications that rely on these SDK versions and persist Claude agent state on disk are therefore affected.", "description_and_impact": "The Claude SDK for Python\u2019s local filesystem memory tool created files with mode 0o666, which are world\u2011readable on systems with a default umask and become world\u2011writable on containers that use permissive umasks. As a result, a local attacker on a shared host could read persisted agent data or write to it, allowing tampering with subsequent Claude responses. This weakness aligns with CWE\u2011276 (Default Permissions) and CWE\u2011732 (Incorrect Permission Assignment).", "risk_and_exploitability": "The CVSS score is 4.8 and the EPSS is below 1\u202f%, indicating a moderate risk level with limited likelihood of widespread exploitation. The attack requires local access on a shared host or within a container; in multi\u2011tenant environments, a malicious user could access or alter memory files, exposing data or influencing model outputs. The vulnerability is not listed in the CISA KEV catalog, suggesting no known widespread exploitation at the time of disclosure."}}}}, "created": "2026-04-02T07:52:07.381223+00:00", "updated": "2026-04-14T16:42:11.955899+00:00", "vendors": ["anthropics", "anthropics$PRODUCT$anthropic-sdk-python"]}