CVE-2023-40586

Name: CVE-2023-40586
Creator: NVD / NIST
Published: 2023-08-25T21:15:09.197+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2023-40586 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Due to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Due to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers. The application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`. This issue was patched in version 3.0.1.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.60%

44.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Coraza	Coraza	3.0.0

References

https://github.com/corazawaf/coraza/commit/a5239ba3ce839e14d9b4f9486e1b4a403dcade8cPatch
https://github.com/corazawaf/coraza/security/advisories/GHSA-c2pj-v37r-2p6hMitigation, Vendor Advisory
https://github.com/corazawaf/coraza/commit/a5239ba3ce839e14d9b4f9486e1b4a403dcade8cPatch
https://github.com/corazawaf/coraza/security/advisories/GHSA-c2pj-v37r-2p6hMitigation, Vendor Advisory

Timeline

Published: Aug 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-40586?

How severe is CVE-2023-40586?

CVE-2023-40586 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2023-40586?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-40586?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST