Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
carrierwaveuploader carrierwave — CarrierWave has a denylisted_content_type bypass via Unescaped Regex Metacharacters
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N R C L L N 6.1 .0022 13.2 —
AFFECTED
Product Versions Fixed
carrierwave < 2.2.7 – —
TIMELINE
May 6 Reserved by GitHub_M
Jun 16 EXPLOIT PUBLISHED — CVE-2026-44587 (carrierwaveuploader carrierwave). Public exploit reference added.
Jun 16 Published (CNA: GitHub_M)
Description
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 6, 2026 | Reserved | Reserved by GitHub_M |
| June 16, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-44587 (carrierwaveuploader carrierwave). Public exploit reference added. |
| June 16, 2026 | Published | Published (CNA: GitHub_M) |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| carrierwaveuploader | carrierwave | — | < 2.2.7 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44587 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.