What is CVE-2026-39889?

CVE-2026-39889 is a high-severity vulnerability in Mervinpraison Praisonai, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-04-08.

How severe is CVE-2026-39889?

High severity. CVSS v3 base score is 7.5 out of 10.

Information disclosure in Mervinpraison Praisonai

CVE-2026-39889

PraisonAI is a multi-agent teams system. Prior to 4.5.115, the A2U (Agent-to-User) event stream server in PraisonAI exposes all agent activity without authentication. The create_a2u_routes() function registers the following endpoints with NO authentication checks: /a2u/info, /a2u/subscribe, /a2u/events/{stream_name}, /a2u/events/sub/{id}, and /a2u/health. This vulnerability is fixed in 4.5.115.

Vulnerability class: Information Disclosure

EPSS: 0.004 (34.2th percentile) — read the EPSS interpretation.

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.

Affected products

Mervinpraison Praisonai — versions < 4.5.115
Praison Praisonai

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-39889?: CVE-2026-39889 is a high-severity vulnerability in Mervinpraison Praisonai, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-04-08.
How severe is CVE-2026-39889?: High severity. CVSS v3 base score is 7.5 out of 10.