CVE-2026-40288
RCE via untrusted YAML in PraisonAI workflow engine
Is CVE-2026-40288 being exploited?
Not confirmed. CVE-2026-40288 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.61% probability of exploitation in the next 30 days.
How severe is CVE-2026-40288?
CVE-2026-40288 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-40288?
Yes. A fix has been recorded for CVE-2026-40288. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40288 affect?
CVE-2026-40288 affects PraisonAI <4.5.139, praisonaiagents <1.5.140. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40288?
Upgrade to 4.5.139 / 1.5.140 immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can execute arbitrary commands/Python on host via crafted workflow YAML (shell, exec, python) in CI/multi-tenant environments
Patch when possible
- affected< 4.5.139
- affected< 1.5.140
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.