CVE-2026-40157 PraisonAI affected by arbitrary file write via path traversal in `praisonai recipe unpack`
Attackers can overwrite arbitrary files via path traversal in PraisonAI recipe unpack, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-40157?
CVE-2026-40157 is a critical path traversal vulnerability in MervinPraison PraisonAI, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-40157?
3 open source packages ship an affected version, including praisonai and PraisonAI. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
praisonai PyPI | From 2.7.2 | 4.5.128 |
praisonai PyPI | From 2.7.2 | 4.5.128 |
PraisonAI PyPI | From 2.7.2 | 4.5.128 |
Products include Praison Praisonai.
How do I fix CVE-2026-40157?
Upgrade praisonai to 4.5.128 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-40157 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40157 exists.
Other vulnerabilities in MervinPraison PraisonAI
- CVE-2026-39888 PraisonAIAgents has a sandbox escape via exception frame traversal in `execute_code` (subprocess mode)
- CVE-2026-41497 Incomplete fix for CVE-2026-34935: Command Injection in MervinPraison/PraisonAI
- CVE-2026-40288 PraisonAI: Critical RCE via `type: job` workflow YAML
- CVE-2026-39890 PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition Loading
- CVE-2026-34934 PraisonAI: Second-Order SQL Injection in `get_all_user_threads`
Sources
Also known as GHSA-99g3-w8gr-x37c, PYSEC-2026-469.