CVE-2026-40157

Name: CVE-2026-40157
Creator: NVD / NIST
Published: 2026-04-10T17:17:13.457+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.4/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2026-40157 is a critical-severity vulnerability rated 9.4/10 on the CVSS scale. PraisonAI is a multi-agent teams system. Prior to 4.5.128, cmd_unpack in the recipe CLI extracts .praison tar archives using raw tar.extract() without validating archive member paths. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

Description

PraisonAI is a multi-agent teams system. Prior to 4.5.128, cmd_unpack in the recipe CLI extracts .praison tar archives using raw tar.extract() without validating archive member paths. A .praison bundle containing ../../ entries will write files outside the intended output directory. An attacker who distributes a malicious bundle can overwrite arbitrary files on the victim's filesystem when they run praisonai recipe unpack. This vulnerability is fixed in 4.5.128.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS 4.0

9.4/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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

EPSS Probability

0.38%

29.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Praison	Praisonai	< 4.5.128

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-99g3-w8gr-x37cExploit, Vendor Advisory
https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-99g3-w8gr-x37cExploit, Vendor Advisory

Timeline

Published: Apr 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40157?

How severe is CVE-2026-40157?

CVE-2026-40157 has a CVSS score of 9.4/10 (CRITICAL severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40157?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40157?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST