CVE-2026-40148 PraisonAI Affected by Decompression Bomb DoS via Recipe Bundle Extraction Without Size Limits
Attackers can cause disk exhaustion and denial of service by publishing malicious recipe bundles with decompression bombs in PraisonAI.
- 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-2026-40148?
CVE-2026-40148 is a medium-severity denial of service vulnerability in MervinPraison PraisonAI, published on 9 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, the _safe_extractall() function in PraisonAI's recipe registry validates archive members against path traversal attacks but performs no checks on individual member sizes, cumulative extracted size, or member count before calling tar.extractall(). An attacker can publish a malicious recipe bundle containing highly compressible data (e.g., 10GB of zeros compressing to ~10MB) that exhausts the victim's disk when pulled via LocalRegistry.pull() or HttpRegistry.pull(). This vulnerability is fixed in 4.5.128.
Weakness: CWE-409
Which versions are affected by CVE-2026-40148?
3 open source packages ship an affected version, including praisonai and PraisonAI. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
praisonai PyPI | All versions | 4.5.128 |
praisonai PyPI | All versions | 4.5.128 |
PraisonAI PyPI | All versions | 4.5.128 |
Products include Praison Praisonai.
How do I fix CVE-2026-40148?
Upgrade praisonai to 4.5.128 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-40148 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40148 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-f2h6-7xfr-xm8w, PYSEC-2026-2912.