CVE-2026-55527 MervinPraison CVE debrief

Who should care

Defenders responsible for PraisonAI's multi-agent teams system, specifically those who manage or use the affected versions, should assess exposure and prioritize verification and remediation.

Why it matters

CVE-2026-55527 is a HIGH-severity vulnerability in PraisonAI's multi-agent teams system that allows an attacker to write JSON data to arbitrary process-writable locations. Defenders should prioritize verifying and upgrading to version 1.6.58 or later to prevent potential data tampering and escalation of privileges.

• Potential data tampering due to unsanitized user_id input
• Possible escalation of privileges through arbitrary process-writable locations
• Need for verification and remediation to prevent exploitation

Technical summary

The FileMemory constructor in PraisonAI's multi-agent teams system joins unsanitized user_id into self.user_path, allowing an attacker to escape the memory directory and write JSON data to arbitrary process-writable locations. The fix involves sanitizing user_id before constructing self.user_path, preventing potential data tampering and escalation of privileges. This issue, fixed in version 1.6.58, has a CVSS score of 7.1 and is considered HIGH severity. Defenders should prioritize verifying and upgrading to version 1.6.58 or later to prevent potential data tampering.

Defensive priority

Defenders should prioritize verifying and upgrading to version 1.6.58 or later to prevent potential data tampering.

Recommended defensive actions

• Verify and upgrade to version 1.6.58 or later
• Review and sanitize user_id input to prevent potential data tampering
• Monitor for any suspicious activity related to PraisonAI's multi-agent teams system
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, its CVSS score, and the fix in version 1.6.58. The vulnerability allows an attacker to write JSON data to arbitrary process-writable locations by supplying unsanitized user_id input. The FileMemory constructor joins unsanitized user_id into self.user_path, enabling an attacker to escape the memory directory. The fix sanitizes user_id before constructing self.user_path. Defenders should verify and upgrade to version 1.6.58 or later to prevent potential data

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.