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CVE-2026-34450

19
FAUCET Score

CVE-2026-34450 impacts the Claude SDK for Python, specifically versions 0.86.0 to before 0.87.0, due to the local filesystem memory tool creating memory files with overly permissive world-readable and potentially world-writable permissions. This medium-severity vulnerability (CVSS 4.8) allows a local attacker on a shared host or within a containerized environment to read persisted agent state or modify memory files, thereby influencing subsequent model behavior. Currently, there is no evidence of active exploitation, public exploit code availability, or significant community discussion surrounding this issue.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.86.0, < 0.87.0CPE matchmatch criteria
cpe:2.3:a:anthropic:claude_sdk_for_python:*:*:*:*:*:python:*:*

CVSS Data

CVSS version used by this source: 4.0

4.8MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
LOW
VS Integrity
LOW
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.12%
Probability of exploitation in next 30 days
EPSS Percentile
2.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0012 is in the 15th percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: anthropicFixed in: 0.87.0

Vendor Advisories (1)

pipGHSA-q5f5-3gjm-7mfmmedium

Claude SDK for Python has Insecure Default File Permissions in Local Filesystem Memory Tool

Apr 1, 2026

References

github.com / anthropics/anthropic-sdk-python/commit/715030ceb4d6dd8d3546e999c680e29532bf1255
Patch
github.com / anthropics/anthropic-sdk-python/releases/tag/v0.87.0
Release Notes
github.com / anthropics/anthropic-sdk-python/security/advisories/GHSA-q5f5-3gjm-7mfm
Vendor Advisory