CVE-2026-39889 json
PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server
published 7mo ago modified 3mo 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
Is CVE-2026-39889 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 6mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-09).
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 Intel 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.