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0 CVE-2026-0668 is a medium-severity vulnerability in the Wikimedia Foundation's MediaWiki VisualData Extension version 1.45. It involves inefficient regular expression complexity, leading to a potential Regular Expression Denial of Service (ReDoS) attack. This vulnerability can be exploited remotely without authentication or user interaction, causing service disruption by exhausting server resources. No known exploits are currently reported in the wild. The impact is limited to availability, with no confidentiality or integrity compromise. European organizations running affected MediaWiki versions with the VisualData extension are at risk of service degradation or downtime. Mitigation requires patching or applying workarounds to limit or optimize regex processing. Countries with significant Wikimedia usage and MediaWiki deployments, such as Germany, France, and the UK, are most likely affected. The vulnerability's CVSS score is 5. Join the discussion | CVE Database V5 | 01/07/2026, 17:36:19 UTC Added: 01/07/2026, 17:57:27 UTC |
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