CVE-2026-34938Public exploitNetwork attack vector

Unauthenticated OS command execution via startswith override

Published Apr 3, 2026 · Updated Apr 3, 2026

Sandbox escape in PraisonAI before 1.5.90 allows remote attackers to execute OS commands through crafted Python code. The _safe_getattr wrapper accepts str subclasses and trusts their overridden startswith() result, permitting underscore-prefixed attribute traversal to subprocess.Popen. No privileges or user interaction are required when execute_code() receives attacker-controlled input, and commands run with the PraisonAI process account.

CVSS severity10.0
Critical
EPSS probability13.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in PraisonAI before 1.5.90 allows remote attackers to execute OS commands through crafted Python code. The _safe_getattr wrapper accepts str subclasses and trusts their overridden startswith() result, permitting underscore-prefixed attribute traversal to subprocess.Popen. No privileges or user interaction are required when execute_code() receives attacker-controlled input, and commands run with the PraisonAI process account.

The record

CVE
CVE-2026-34938
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
Mervin Praison
Product
PraisonAI
Classifications
CWE-693, T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.5.90

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mervin Praison · PraisonAIversion=< 1.5.90

Published CVSS scores

10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1059.006Command and Scripting Interpreter: Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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