High severity · published Aug 25, 2023
CVE-2023-40586
go package github.com/corazawaf/coraza is vulnerable to denial of service
7.5
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
coraza · corazawaf
< 3.0.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-40586
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-40586
Patch
https://github.com/corazawaf/coraza/commit/a5239ba3ce839e14d9b4f9486e1b4a403dcade8c
Mitigation
https://github.com/corazawaf/coraza/security/advisories/GHSA-c2pj-v37r-2p6h
More from coraza
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CVE-2026-107826
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OWASP Coraza WAF: Silent argument drop at ArgumentLimit allows bypass of ARGS-targeted rules via parameter flooding
5.9
CVE-2026-107833
OWASP Coraza WAF: Unbounded recursion in JSON response body processor causes CPU exhaustion
5.8
CVE-2026-114100
Coraza from 3.0.4 before 3.8.1 Request Body Inspection Bypass via Content-Type
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CVE-2026-114099
Coraza 3.0.0 before 3.8.1 WAF Bypass via JSON Key Collision