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TI-2026-78714 Aliases CVE-2026-114101

Multipart filename* charset handling bypasses Coraza FILES rules

Priority MEDIUM 61CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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. An unauthenticated remote attacker can send a decoy filename or a filename* parameter alone, so FILES-based rules never see the real name and dangerous uploads can reach backends that honor filename*. This is classified as CWE-20, improper input validation.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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*.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00251 16th percentileScored 2026-11-07
Fix Fixed coraza (corazawaf): 3.8.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
corazawafcorazabefore 3.8.13.8.1Patch availableCNA
  • coraza Vendorcorazawaf Affected before 3.8.1 Fixed in 3.8.1 Patch available CNA

Remediation

Upgrade Coraza to version 3.8.1 or later, which fixes this issue. CISA's SSVC data indicates a proof of concept exists.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA coraza (corazawaf) Fixed in 3.8.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    corazawaf coraza 3.8.1

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-78712 Coraza JSON key collision lets SQL injection evade WAF rulesPriority MEDIUM 64
    • TI-2026-78713 Request body inspection bypass in Coraza via Content-Type parametersPriority LOW 36
    Show all 3 records →

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-114101
  2. 2026-10-22 Priority changed: MEDIUM → LOW
  3. 2026-10-28 CISA SSVC decision points changed
  4. 2026-10-28 Priority changed: LOW → MEDIUM

References

Advisory 1

  • TI-2026-69592 Uncontrolled recursion in Coraza WAF JSON parsing crashes the process CVSS 3.1HIGH 7.5
  • TI-2026-71270 Coraza WAF silently drops arguments at ArgumentLimit, enabling rule bypass CVSS 3.1HIGH 7.2
  • TI-2026-71268 Off-by-one error in OWASP Coraza jsDecode enables WAF rule bypass CVSS 3.1MEDIUM 5.8
  • TI-2026-78712 Coraza JSON key collision lets SQL injection evade WAF rules CVSS 4.0MEDIUM 6.9
  • TI-2026-69596 Uncontrolled recursion in Coraza WAF JSON processing exhausts CPU CVSS 3.1MEDIUM 5.9
  • TI-2026-71308 CRLF injection in OWASP Coraza WAF native audit log lets attackers forge lines CVSS 3.1MEDIUM 5.8
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences