# CVE-2023-40586: GO-2023-1874 - Denial of service in github.com/corazawaf/coraza/v2 and v3

Source: https://junglewise.ai/threats/cve-2023-40586-coraza-has-potential-denial-of-service-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-07-05  
License: CC BY 4.0 with a link back

CVE-2023-40586 · Severity: low · CVSS 3.1 · Published 2023-07-05

Denial of service in github.com/corazawaf/coraza/v2 and v3

Technologies: [github.com/corazawaf/coraza/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-corazawaf-coraza-v2), [github.com/corazawaf/coraza/v3 (Go)](https://junglewise.ai/threats/technologies/github-com-corazawaf-coraza-v3). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2023-40586 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-40586 being exploited in the wild.

**How severe is CVE-2023-40586?** Low severity, with a CVSS score of 3.1, published 5 July 2023.

**Which products and versions are affected?** github.com/corazawaf/coraza/v2 (Go) SEMVER:introduced=0, SEMVER:introduced=2.0.0,last_affected=2.0.1; github.com/corazawaf/coraza/v3 (Go) SEMVER:introduced=0,fixed=3.0.1, SEMVER:introduced=3.0.0,fixed=3.0.1.

**Is there a fix for CVE-2023-40586?** Yes. github.com/corazawaf/coraza/v3 (Go): upgrade to 3.0.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-40586?** Check whether you run github.com/corazawaf/coraza/v2 (Go) or github.com/corazawaf/coraza/v3 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/corazawaf/coraza/v3 (Go): upgrade to 3.0.1 or later

  ```sh
  go get github.com/corazawaf/coraza/v3@v3.0.1
  ```


## Affected products

- github.com/corazawaf/coraza/v2 (Go) SEMVER:introduced=0, SEMVER:introduced=2.0.0,last_affected=2.0.1
- github.com/corazawaf/coraza/v3 (Go) SEMVER:introduced=0,fixed=3.0.1, SEMVER:introduced=3.0.0,fixed=3.0.1

## Identifiers

- CVE-2023-40586
- GHSA-c2pj-v37r-2p6h
- GO-2023-1874

## Related threats

- [Coraza multipart filename rule bypass via RFC 5987 charset handling](https://junglewise.ai/threats/cve-2026-114101-coraza-before-3-8-1-extracts-multipart-upload-filenames-with-go)
- [Coraza request body inspection bypass in Content-Type parsing](https://junglewise.ai/threats/cve-2026-114100-coraza-from-3-0-4-before-3-8-1-contains-a-request-body)
- [Coraza JSON body processor key collision WAF bypass](https://junglewise.ai/threats/cve-2026-114099-coraza-from-3-0-0-before-3-8-1-has-a-json-body-processor-that)
- [Coraza multipart strict validation bypass via truncated body](https://junglewise.ai/threats/cve-2026-41508-coraza-truncated-multipart-body-bypasses-multipart-strict-error)
- [Coraza CRLF injection in Native audit-log format](https://junglewise.ai/threats/cve-2026-41504-coraza-native-audit-log-format-allows-crlf-injection-and-log)