CVE-2026-44587— CarrierWave has a denylisted_content_type bypass via Unescaped Regex Metacharacters

CarrierWave has a denylisted_content_type bypass via Unescaped Regex Metacharacters

CarrierWave is a framework to upload files from Ruby applications. In versions prior to 2.2.7 and 3.1.3, the content_type_denylist check fails to escape regex metacharacters in string entries, causing the denylist to silently not match the content types it is intended to block. In lib/carrierwave/uploader/content_type_denylist.rb:57, denylist entries are interpolated directly into a regex without Regexp.quote or anchoring, so an entry such as image/svg+xml becomes the pattern /image\/svg+xml/, in which + is treated as a quantifier rather than a literal character and therefore never matches the real MIME type image/svg+xml. This is inconsistent with the allowlist implementation, which correctly applies both Regexp.quote and a \A anchor. Other content types containing regex metacharacters, such as application/xhtml+xml, are affected as well. As a result, any application that relies on content_type_denylist to block image/svg+xml, most commonly to prevent stored XSS, is silently unprotected. An attacker can upload an SVG file containing arbitrary JavaScript; if the application serves that SVG inline from its own origin, the script executes in the victim's browser, resulting in stored XSS. This issue has been fixed in versions 2.2.7 and 3.1.3.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

宽松定义的正则表达式

carrierwave 输入验证错误漏洞

CarrierWave carrierwave是CarrierWave个人开发者的一个Ruby文件上传组件。 carrierwave 2.2.7之前版本和3.1.3之前版本存在安全漏洞，该漏洞源于content_type_denylist检查未能转义字符串条目中的正则表达式元字符，导致黑名单无法正确匹配预期阻止的内容类型，可能导致存储型跨站脚本攻击。

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