How severe is CVE-2026-34935?

CVE-2026-34935 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34935 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34935?

CVE-2026-34935 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34935?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34935 have an EU (EUVD) identifier?

Yes. CVE-2026-34935 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18913.

When was CVE-2026-34935 published?

CVE-2026-34935 was published on 2026-04-03 and last updated on 2026-06-17.

CVE-2026-34935

CVE-2026-34935 is a critical-severity vulnerability in Praison Praisonai with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18913
Weakness: CWE-78
Affected product: Praison Praisonai
Published: 2026-04-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-34935?: CVE-2026-34935 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34935 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34935?: CVE-2026-34935 affects Praison Praisonai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34935?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34935 have an EU (EUVD) identifier?: Yes. CVE-2026-34935 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18913.
When was CVE-2026-34935 published?: CVE-2026-34935 was published on 2026-04-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*

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