CVE-2026-55531

PraisonAI: Unauthenticated unbounded session accumulation in the PraisonAI MCP HTTP server (memory exhaustion; session TTL never enforced)

At a glance

Severity: MEDIUM 6.5
EPSS: EPSS 0.45 % · percentile 39 (2026-10-27)
State: PUBLISHED
Published: 2026-08-25
Updated: 2026-08-25
Assigner: GitHub_M
NVD status: Deferred

Description

PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream mcp_post handler creates a new _sessions entry for every initialize request but does not call _cleanup_sessions or enforce a maximum. An unauthenticated caller can exhaust memory. The fix invokes cleanup and limits sessions through PRAISONAI_MCP_MAX_SESSIONS. This issue is fixed in version 4.6.58.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	GitHub_M
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	NVD · security-advisories@github.com (Secondary)

Weaknesses (CWE)

Advisories

GHSA-wv94-5qcp-6m36 — PraisonAI MCP HTTP server has unauthenticated unbounded session accumulation (memory exhaustion; session TTL never enforced)
PYSEC-2026-3897 — PraisonAI MCP HTTP server has unauthenticated unbounded session accumulation (memory exhaustion; session TTL never enforced)

European references

ENISA EUVD · EUVD-2026-65498
GCVE · GCVE-0-2026-55531

Affected products

Product	Versions
MervinPraison · PraisonAI	affected < 4.6.58

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD