# CVE-2026-34452: Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape

> A race condition in the Claude Python SDK allows local attackers to escape the sandbox via symlink manipulation, enabling unauthorized file access.

- **Severity:** Medium 5.8 (`CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 Mar 2026
- **Updated:** 3 Apr 2026
- **Also known as:** ECHO-38d5-c884-2737, GHSA-w828-4qhx-vxx3, PYSEC-2026-2115

## What is CVE-2026-34452?

CVE-2026-34452 is a medium-severity vulnerability in anthropics anthropic-sdk-python, published on 31 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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 async local filesystem memory tool in the Anthropic Python SDK validated that model-supplied paths resolved inside the sandboxed memory directory, but then returned the unresolved path for subsequent file operations. A local attacker able to write to the memory directory could retarget a symlink between validation and use, causing reads or writes to escape the sandbox. The synchronous memory tool implementation was not affected. This issue has been patched in version 0.87.0.

Weakness: CWE-59 (Improper Link Resolution Before File Access), CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

## Which versions are affected by CVE-2026-34452?

3 open source packages ship an affected version, including anthropic. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `anthropic` | PyPI | From 0.86.0 | 0.87.0 |
| `anthropic` | PyPI | From 0.86.0 | 0.87.0 |
| `anthropic` | PyPI | From 0.86.0 | 0.87.0 |

Products: Anthropic Claude Sdk for Python.

## How do I fix CVE-2026-34452?

Upgrade anthropic to 0.87.0 or later.

## Is CVE-2026-34452 being exploited?

There is no known exploitation of CVE-2026-34452 in the wild and no public exploit code.

## Other vulnerabilities in anthropics anthropic-sdk-python

- [CVE-2026-34450](https://insights.sbomify.com/CVE-2026-34450/): Claude SDK for Python: Insecure Default File Permissions in Local Filesystem Memory Tool (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34452 and fix it if it is affected.

What it is: CVE-2026-34452 is a medium-severity vulnerability in anthropics anthropic-sdk-python, published on 31 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-34452 in the wild and no public exploit code.

Affected packages and fixed versions:
- anthropic (PyPI): affected from 0.86.0; fixed in 0.87.0
- anthropic (PyPI): affected from 0.86.0; fixed in 0.87.0
- anthropic (PyPI): affected from 0.86.0; fixed in 0.87.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34452/ (Markdown: https://insights.sbomify.com/CVE-2026-34452/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34452
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34452
- OSV: https://osv.dev/vulnerability/CVE-2026-34452

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34452/
Summaries are generated and may contain mistakes; the official description above is the record.