CVE-2026-55531CWE-400CWE-770denial-of-service

CVE-2026-55531

Medium · published August 25, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
38.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00452 · 38.3th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-08-25T19:16Z
References (4)
https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1 · [email protected]https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58 · [email protected]https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wv94-5qcp-6m36 · [email protected]https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wv94-5qcp-6m36 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 27 AUG 06:36Z
    EPSS moved — → 0%
    epss
  • 25 AUG 14:33Z
    PraisonAI: Unauthenticated unbounded session accumulation in the PraisonAI MCP HTTP server (memory exhaustion; session TTL never enforced)
    cvelistv5