What is CVE-2026-34955?

CVE-2026-34955 is a high-severity vulnerability in Mervinpraison Praisonai, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-04-04.

How severe is CVE-2026-34955?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Mervinpraison Praisonai

CVE-2026-34955

PraisonAI is a multi-agent teams system. Prior to version 4.5.97, SubprocessSandbox in all modes (BASIC, STRICT, NETWORK_ISOLATED) calls subprocess.run() with shell=True and relies solely on string-pattern matching to block dangerous commands. The blocklist does not include sh or bash as standalone executables, allowing trivial sandbox escape in STRICT mode via sh -c '<command>'. This issue has been patched in version 4.5.97.

Vulnerability class: Command Injection (OS Command Injection)

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (30.5th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Mervinpraison Praisonai — versions < 4.5.97
Praison Praisonai

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/MervinPraison/PraisonAI/security/advisories/GHSA-r4f2-3m54-pp7q (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34955?: CVE-2026-34955 is a high-severity vulnerability in Mervinpraison Praisonai, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-04-04.
How severe is CVE-2026-34955?: High severity. CVSS v3 base score is 8.8 out of 10.