RCE in Mervinpraison Praisonai
CVE-2026-61439
PraisonAI versions before 4.6.78 contain a prompt injection defense misconfiguration where the block threshold defaults to CRITICAL severity, allowing HIGH-level threats to pass through unblocked. Attackers can submit single-vector prompt injection attacks such as instruction overrides or financial manipulation that trigger HIGH severity detection but are logged without blocking, enabling system prompt extraction and unauthorized tool invocations.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.6% 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 0, 4.6.78
Weakness classification (CWE)
References
- github.com/MervinPraison/PraisonAI/security/advisories/GHSA-fj8f-m44g-c479 (vendor-advisory)
- www.vulncheck.com/advisories/praisonai-before-prompt-injection-defense-bypass (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61439?
- CVE-2026-61439 is a high-severity vulnerability in Mervinpraison Praisonai, classified under Initialization of a Resource with an Insecure Default. CVSS score: 7.5/10. Published 2026-07-11.
- How severe is CVE-2026-61439?
- High severity. CVSS v3 base score is 7.5 out of 10.