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CVE-2026-114101— Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass

Quick assessment

Affected
corazawaf coraza
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Coraza 3.8.1 之前的版本中，使用 Go 的 函数解析 multipart 上传的文件名时，会静默忽略 参数中字符集（charset）不是 UTF-8 或 US-ASCII 的 RFC 5987 编码内容。未认证的攻击者可构造一个带有 或仅包含 参数的诱饵文件名，导致基于 的安全规则无法检测到真实文件名，从而使危险的上传文件绕过检测并抵达后端系统（若后端系统支持并信任 参数）。

CVSS 4.0 · Medium
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I. Basic Information for CVE-2026-114101

Vulnerability Information
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Vulnerability Title
Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass
Source: CVE Program / CVE List V5
Vulnerability 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*.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
corazawaf coraza 0 ~ 3.8.1 -

II. Public POCs for CVE-2026-114101

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III. Intelligence Information for CVE-2026-114101

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Vendor Advisories for CVE-2026-114101 (2)

Same Patch Batch · corazawaf · 2026-10-21 · 3 CVEs total

CVE-2026-114100 5.8 MEDIUM Coraza from 3.0.4 before 3.8.1 Request Body Inspection Bypass via Content-Type
CVE-2026-114099 5.8 MEDIUM Coraza 3.0.0 before 3.8.1 WAF Bypass via JSON Key Collision

IV. Related Vulnerabilities

Same product: coraza
Same vendor: corazawaf
Same weakness: CWE-20

V. Comments for CVE-2026-114101

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