CVE-2026-114101 Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-114101?
CVE-2026-114101 is a medium-severity vulnerability in corazawaf coraza, published on 21 Oct 2026.
Official 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*.
Weakness: CWE-20
Which versions are affected by CVE-2026-114101?
5 open source packages ship an affected version, including github.com/corazawaf/coraza/v3, github.com/corazawaf/coraza and github.com/corazawaf/coraza/v2.
| Package | Affected | Fixed in |
|---|---|---|
github.com/corazawaf/coraza/v3 Go | All versions | 3.8.1 |
github.com/corazawaf/coraza/v3 Go | All versions | 3.8.1 |
github.com/corazawaf/coraza/v3 Go | All versions | 3.8.1 |
github.com/corazawaf/coraza Go | All versions | None |
github.com/corazawaf/coraza/v2 Go | All versions | None |
How do I fix CVE-2026-114101?
Upgrade github.com/corazawaf/coraza/v3 to 3.8.1 or later.
Is CVE-2026-114101 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-114101 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-3wr7-993q-jrff, GHSA-7xj5-pmcw-rwmp, GO-2026-6691.