{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34939", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-31T17:27:08.660Z", "datePublished": "2026-04-03T22:52:32.763Z", "dateUpdated": "2026-04-06T19:05:34.164Z"}, "containers": {"cna": {"title": "PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()", "problemTypes": [{"descriptions": [{"cweId": "CWE-1333", "lang": "en", "description": "CWE-1333: Inefficient Regular Expression Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7f", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7f"}], "affected": [{"vendor": "MervinPraison", "product": "PraisonAI", "versions": [{"version": "< 4.5.90", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-03T22:52:32.763Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-8w9j-hc3g-3g7f", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-06T19:05:21.329885Z", "id": "CVE-2026-34939", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-06T19:05:34.164Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*", "matchCriteriaId": "072B6350-7972-417B-8540-DAAFF3230EC7", "versionEndExcluding": "4.5.90", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-34939", "lastModified": "2026-04-09T16:57:59.227", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-03T23:17:06.330", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-8w9j-hc3g-3g7f"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.5.90)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "PraisonAI", "source": "cna", "vendor": "MervinPraison"}, "product": "praisonai", "vendor": "mervinpraison"}], "analysis": {"en": {"generated_at": "2026-04-09T18:29:48.951697+00:00", "value": {"mitigation_remediation": ["Upgrade PraisonAI to version 4.5.90 or later, which applies the necessary fix.", "If an immediate upgrade is not possible, add input validation or impose a time\u2011out on regex compilation to prevent catastrophic backtracking.", "Monitor the service for unusually long processing times and consider rate\u2011limiting requests to the search endpoint."], "summary": {"action": "Patch/Upgrade", "impact": "Denial of Service via regular expression backtracking"}, "threat_synthesis": {"affected_systems": "The flaw exists in the PraisonAI platform developed by MervinPraison. Versions prior to 4.5.90 are vulnerable. The 4.5.90 release and later contain the necessary patch.", "description_and_impact": "MCPToolIndex.search_tools() in PraisonAI accepts a user\u2011supplied string and compiles it directly as a Python regular expression without any validation, sanitization or timeout. An attacker can send a specially crafted pattern that triggers catastrophic backtracking in Python\u2019s re engine, causing the thread to block for hundreds of seconds and resulting in a full service outage. The main consequence is a denial of service, affecting system availability.", "risk_and_exploitability": "This vulnerability has a CVSS score of 6.5, indicating moderate severity. The EPSS score is below 1%, suggesting a low probability of exploitation in the wild, and it is not listed in the CISA KEV catalog. If the search_tools() function is exposed to external input\u2014through an API or other interface\u2014a remote attacker could send a crafted expression to trigger the denial of service. No additional exploitation requirements are stated in the description, so an attacker would need the ability to submit a custom regex."}}}}, "created": "2026-04-06T21:21:51.007775+00:00", "updated": "2026-04-10T09:45:34.423386+00:00", "vendors": ["mervinpraison", "mervinpraison$PRODUCT$praisonai"]}