Medium severity6.5NVD Advisory· Published Apr 3, 2026· Updated Apr 9, 2026
CVE-2026-34939
CVE-2026-34939
Description
PraisonAI is a multi-agent teams system. Prior to version 4.5.90, MCPToolIndex.search_tools() compiles a caller-supplied string directly as a Python regular expression with no validation, sanitization, or timeout. A crafted regex causes catastrophic backtracking in the re engine, blocking the Python thread for hundreds of seconds and causing a complete service outage. This issue has been patched in version 4.5.90.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
praisonaiPyPI | < 4.5.90 | 4.5.90 |
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7fnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-8w9j-hc3g-3g7fghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-34939ghsaADVISORY
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