6.3

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

Awaiting analysis
AliasesGHSA-3wr7-993q-jrffGO-2026-6691
Published 21-10-2026Last modified 28-10-2026

Vulnerability summary

CVE-2026-114101 is a medium (CVSS 6.3) Improper Input Validation vulnerability in corazawaf coraza. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.25%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 21-10-2026
    PublishedVulnerability first disclosed.
  2. 28-10-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

21-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/corazawaf/coraza2 products
  • v2All versions (No fix recorded)
  • v3< 3.8.1
Corazawaf1 product
Github.com/corazawaf1 product
  • corazaAll versions (No fix recorded)

3 vendors · 4 products

References

7 links