---
title: "CVE-2026-34938: PraisonAI: Python Sandbox Escape via str Subclass startswith() Override in execute_code"
url: https://erroneo.us/security/cve/CVE-2026-34938/
description: "CVE-2026-34938 (praisonaiagents (PyPI)): PraisonAI is a multi-agent teams system. Prior to version 1.5.90, executecode() in praisonai-agents runs…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-03
date_modified: 2026-04-06
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-34938"
kev: false
cvss: 10
epss: 0.00842
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-34938: PraisonAI: Python Sandbox Escape via str Subclass startswith() Override in execute_code

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.8% , percentile 57: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 57% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes praisonaiagents (PyPI) <= 1.5.89, fixed in 1.5.90 . Check your lockfile, including transitive dependencies.

## What it is

PraisonAI is a multi-agent teams system. Prior to version 1.5.90, executecode() in praisonai-agents runs attacker-controlled Python inside a three-layer sandbox that can be fully bypassed by passing a str subclass with an overridden startswith() method to the safegetattr wrapper, achieving arbitrary OS command execution on the host. This issue has been patched in version 1.5.90.

## Affected packages

- PyPI `praisonaiagents` <= 1.5.89 → fixed: 1.5.90

## Affected products (CVE record)

- MervinPraison PraisonAI: < 1.5.90

## Severity

- GitHub_M CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.84% probability of exploitation activity in the next 30 days; percentile 57.

## Sources

- [GitHub Advisory GHSA-6vh2-h83c-9294](https://github.com/advisories/GHSA-6vh2-h83c-9294)
- [CVE.org record CVE-2026-34938](https://www.cve.org/CVERecord?id=CVE-2026-34938)
- [NVD entry CVE-2026-34938](https://nvd.nist.gov/vuln/detail/CVE-2026-34938)
- [github.com](https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-6vh2-h83c-9294)

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Source page: https://erroneo.us/security/cve/CVE-2026-34938/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt