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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-44587)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-44587)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
444523	SCA: security update for carrierwave (GHSA-7g26-2qgj-chfg)	Tenable Cloud Security	SCA Checks	medium
444523	SCA: security update for carrierwave (GHSA-7g26-2qgj-chfg)	Tenable Self-Hosted Container Security	SCA Checks	medium
321723	Linux Distros Unpatched Vulnerability : CVE-2026-44587	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-44587

medium

Tenable Plugins

medium

medium

medium