CVE-2026-114101

CVSS 6.3 (medium) · published 2026-10-21

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*.

Weakness: CWE-20

Source: NVD CVE-2026-114101

References

• https://github.com/corazawaf/coraza/security/advisories/GHSA-3wr7-993q-jrff
• https://www.vulncheck.com/advisories/coraza-before-3.8.1-multipart-filename-charset-handling-files-rule-bypass
• https://github.com/corazawaf/coraza/security/advisories/GHSA-3wr7-993q-jrff

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