CVE-2026-39889 json
PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server
published 2026-04-08 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-20636 , GHSA-f292-66h9-fpmf , PYSEC-2026-2911
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi praisonai 4.5.115
- praison praisonai 4.5.115
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | praisonai | <4.5.115 |
4.5.115 |
Affected products
- MervinPraison PraisonAI
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/MervinPraison/PraisonAI/security/advisories/GHSA-f292-66h9-fpmf
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-39889
advisory
-
github.com
/MervinPraison/PraisonAI
package
-
github.com
/MervinPraison/PraisonAI/releases/tag/v4.5.115
web
-
pypi.org
/project/praisonai
package
-
github.com
/advisories/GHSA-f292-66h9-fpmf
advisory
Sources
- CVE List CVE-2026-39889
- GitHub Advisory GHSA-f292-66h9-fpmf
- NVD CVE-2026-39889
- OSV PYSEC-2026-2911
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.