CVE-2026-114101

Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass

Published Oct 21, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
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*.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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*.
Title Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass
First Time appeared Coraza
Coraza coraza
Weaknesses CWE-20
CPEs cpe:2.3:a:coraza:coraza:*:*:*:*:*:*:*:*
Vendors & Products Coraza
Coraza coraza
References
Metrics cvssV3_1

{'score': 4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 28, 2026, 1:51 PM
Reserved
Oct 20, 2026, 9:47 PM
Status
Awaiting Analysis
Published
Oct 21, 2026, 1:17 AM
Modified
Oct 28, 2026, 2:16 PM