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CVE-2023-40586

21
FAUCET Score

CVE-2023-40586 is a denial-of-service vulnerability affecting OWASP Coraza WAF, a ModSecurity-compatible web application firewall library. An attacker can crash applications using Coraza by sending crafted requests that trigger an error in mime.ParseMediaType, leading to the misuse of log.Fatalf. This high-severity vulnerability (CVSS 7.5) is easily exploitable over the network with low attack complexity, resulting in a complete loss of availability for the affected application. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.0.0CPE matchmatch criteria
cpe:2.3:a:coraza:coraza:3.0.0:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
45.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 22nd percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/corazawaf/coraza/v3Fixed in: 3.0.1

Vendor Advisories (1)

goGHSA-c2pj-v37r-2p6hhigh

Coraza has potential denial of service vulnerability

Jun 26, 2023

References

github.com / corazawaf/coraza/commit/a5239ba3ce839e14d9b4f9486e1b4a403dcade8c
Patch
github.com / corazawaf/coraza/security/advisories/GHSA-c2pj-v37r-2p6h
MitigationVendor Advisory