{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-16270", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-07-20T09:17:36.606Z", "datePublished": "2026-07-22T12:37:13.205Z", "dateUpdated": "2026-07-22T12:37:13.205Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-07-22T12:37:13.205Z"}, "title": "ReDoS in Open Mercato", "datePublic": "2026-07-22T12:32:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-1333", "description": "CWE-1333 Inefficient regular expression complexity", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-492", "descriptions": [{"lang": "en", "value": "CAPEC-492 Regular Expression Exponential Blowup"}]}], "affected": [{"vendor": "Open Mercato", "product": "Open Mercato", "repo": "https://github.com/open-mercato/open-mercato", "versions": [{"status": "affected", "version": "0", "lessThan": "0.6.4", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Open Mercato does not validate regex rules. An attacker with privileges to create the regex rule can add an unsafe regex to a field. When someone provide the proper string it can result in a DoS attack.\n\n\nThis issue was fixed in version 0.6.4.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Open Mercato does not validate regex rules. An attacker with privileges to create the regex rule can add an unsafe regex to a field. When someone provide the proper string it can result in a DoS attack.<div><br></div><div>This issue was fixed in version 0.6.4.</div>"}]}], "tags": ["x_open-source"], "references": [{"url": "https://cert.pl/posts/2026/07/CVE-2026-16270", "tags": ["third-party-advisory"]}, {"url": "https://www.openmercato.com/", "tags": ["product"]}, {"url": "https://github.com/open-mercato/open-mercato/pull/1996", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.9, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "Pawel Scibiorski", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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