Vulnerability · Published Aug 25, 2026 · Assigned by GitHub_M

CVE-2026-55531PraisonAI: Unauthenticated unbounded session accumulation in the PraisonAI MCP HTTP server (memory exhaustion; session TTL never enforced)

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in PraisonAI from MervinPraison. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 60.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	praisonai	4.6.58	GHSA-wv94-5qcp-6m36
PyPI	praisonai	4.6.58	PYSEC-2026-3897

Affected products (as reported)

Vendor	Product	Versions
MervinPraison	PraisonAI	< 4.6.58

Weakness: CWE-400, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wv94-5qcp-6m36 x_refsource_CONFIRM
https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1 x_refsource_MISC
https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58 x_refsource_MISC