CVE-2026-40148Public exploitNetwork attack vector

Disk exhaustion via unbounded recipe bundle extraction

Published Apr 9, 2026 · Updated Apr 9, 2026

Improper compressed-data handling in PraisonAI before 4.5.128 allows remote attackers to exhaust disk space through a malicious recipe bundle. The recipe registry's _safe_extractall() passes every tar member to tar.extractall() without checking member size, total expanded size, or member count. Exploitation requires the bundle to be pulled through LocalRegistry.pull() or HttpRegistry.pull(), after which expansion can fill the host filesystem and interrupt PraisonAI and colocated applications.

CVSS severity6.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper compressed-data handling in PraisonAI before 4.5.128 allows remote attackers to exhaust disk space through a malicious recipe bundle. The recipe registry's _safe_extractall() passes every tar member to tar.extractall() without checking member size, total expanded size, or member count. Exploitation requires the bundle to be pulled through LocalRegistry.pull() or HttpRegistry.pull(), after which expansion can fill the host filesystem and interrupt PraisonAI and colocated applications.

The record

CVE
CVE-2026-40148
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
PraisonAI
Product
PraisonAI
Classifications
CWE-409, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 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=< 4.5.128

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PraisonAI · PraisonAIversion=< 4.5.128

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
T1499.004Application or System Exploitation

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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