What is CVE-2026-34935?

CVE-2026-34935 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-04-03.

How severe is CVE-2026-34935?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Mervinpraison Praisonai

CVE-2026-34935

PraisonAI is a multi-agent teams system. From version 4.5.15 to before version 4.5.69, the --mcp CLI argument is passed directly to shlex.split() and forwarded through the call chain to anyio.open_process() with no validation, allowlist check, or sanitization at any hop, allowing arbitrary OS command execution as the process user. This issue has been patched in version 4.5.69.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-04-03 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.010 · change: +0.002

Affected products

Mervinpraison Praisonai — versions >= 4.5.15, < 4.5.69
Praison Praisonai

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/MervinPraison/PraisonAI/security/advisories/GHSA-9gm9-c8mq-vq7m (Exploit, Vendor Advisory)
github.com/MervinPraison/PraisonAI/commit/47bff65413beaa3c21bf633c1fae4e6843483… (Patch)

Frequently asked questions

What is CVE-2026-34935?: CVE-2026-34935 is a critical-severity vulnerability in Mervinpraison Praisonai, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-04-03.
How severe is CVE-2026-34935?: Critical severity. CVSS v3 base score is 9.8 out of 10.