CVE-2026-40115 PraisonAI has an Unrestricted Upload Size in WSGI Recipe Registry Server Enables Memory Exhaustion DoS
Attackers can cause denial of service by sending large requests to the WSGI server, which lacks size limits and defaults to no authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40115?
CVE-2026-40115 is a medium-severity denial of service vulnerability in MervinPraison PraisonAI, published on 9 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
PraisonAI is a multi-agent teams system. Prior to 4.5.128, the WSGI-based recipe registry server (server.py) reads the entire HTTP request body into memory based on the client-supplied Content-Length header with no upper bound. Combined with authentication being disabled by default (no token configured), any local process can send arbitrarily large POST requests to exhaust server memory and cause a denial of service. The Starlette-based server (serve.py) has RequestSizeLimitMiddleware with a 10MB limit, but the WSGI server lacks any equivalent protection. This vulnerability is fixed in 4.5.128.
Weakness: CWE-770
Which versions are affected by CVE-2026-40115?
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-2026-40115?
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-2026-40115 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40115 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-2xgv-5cv2-47vv, PYSEC-2026-2896.