Medium severity · published Oct 21, 2026
CVE-2026-114101
Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass
4.0
CVSS
0.3%
EPSS
No
On KEV
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*.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
coraza · corazawaf
before 3.8.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114101
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114101
github.com
https://github.com/corazawaf/coraza/security/advisories/GHSA-3wr7-993q-jrff
www.vulncheck.com
https://www.vulncheck.com/advisories/coraza-before-3.8.1-multipart-filename-charset-handling-files-rule-bypass
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