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{"bugzilla": {"description": "MediaWiki: MediaWiki VisualData Extension: Denial of Service via inefficient regular expression", "id": "2427616", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427616"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in Wikimedia Foundation MediaWiki - VisualData Extension. A remote attacker could exploit an inefficient regular expression, leading to a Regular Expression Denial of Service (ReDoS). This vulnerability allows an attacker to provide specially crafted input that causes the regular expression engine to consume excessive processing time, resulting in a denial of service for the affected system."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, disable the VisualData extension in MediaWiki if it is not essential for your deployment. This can typically be done by commenting out or removing the `wfLoadExtension('VisualData');` line in `LocalSettings.php`. A restart of the web server or PHP-FPM service may be required for the changes to take effect."}, "name": "CVE-2026-0668", "public_date": "2026-01-07T17:36:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-0668\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0668\nhttps://gerrit.wikimedia.org/r/q/I4ff2737c9f0ba805267d1fc8296e7cff61241ee3\nhttps://gerrit.wikimedia.org/r/q/I893a9fca694a2613e29e149dea2d76d7f06063e5\nhttps://gerrit.wikimedia.org/r/q/Ie08d9a8ceb2c9a22a635cfc27964353f14072dbf\nhttps://gerrit.wikimedia.org/r/q/Ifbf9c2ade621226e14fe852f3217293772bf8bb8\nhttps://phabricator.wikimedia.org/T387008"], "statement": "This vulnerability is rated Moderate for Red Hat. The MediaWiki VisualData Extension is vulnerable to a Regular Expression Denial of Service (ReDoS) attack. Exploitation requires an attacker to provide crafted user input, which can lead to a denial of service by consuming excessive resources. This issue affects MediaWiki - VisualData Extension version 1.45.", "threat_severity": "Moderate"}

{"created": "2026-01-08T09:48:00.302637+00:00", "updated": "2026-01-08T09:48:00.302673+00:00", "vendors": ["mediawiki", "mediawiki$PRODUCT$mediawiki", "wikimedia", "wikimedia$PRODUCT$mediawiki-visualdata_extension"]}