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CVE-2026-114101GHSA-3wr7-993q-jrffGO-2026-6691

Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass

corazawaf corazaGoLibraries & packages
Open in ThreatlineRecord JSON
CVSS
6.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3.8.1Fixed versionCVE List
Published21 Oct 2026Updated 21 Oct 2026CVE List

What fixes it

  • 3.8.1corazaCVE List
  • 3.8.1github.com/corazawaf/coraza/v3, GoOSVgo get github.com/corazawaf/coraza/v3@v3.8.1

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Coraza before 3.8.1 extracts multipart upload filenames with Go's mime.ParseMediaType, which silently ignores RFC 5987 filename* parameters whose charset is not utf-8 or us-ascii. Unauthenticated attackers can send a decoy filename with filename*=iso-8859-1''shell.php, or filename* alone, so FILES-based rules never see the real name, letting dangerous uploads reach backends that honor filename*.

Text from CVE List

Affected versions 3

  • corazaaffected: all versions before 3.8.1CVE List
  • corazaunaffected: 3.8.1CVE List
  • github.com/corazawaf/coraza/v3, Gofrom first release, fixed in 3.8.1OSV

References 2