Stack Overflow Vulnerability in OWASP Coraza WAF by OWASP
CVE-2026-107826

7.5HIGH

Key Information:

Vendor

Corazawaf

Status
Coraza
Vendor
CVE Published:
9 October 2026

What is CVE-2026-107826?

The OWASP Coraza WAF, a Golang-based web application firewall, has a vulnerability in its JSON parsing functionality. This issue arises in versions 3.0.0 through 3.8.1 where the readJSON function may fail to restrain its bounded processing. As a result, an unauthenticated attacker can craft a maliciously formed JSON payload that, while conforming to size constraints, includes deeply nested data structures. This leads to an uncontrolled recursion during validation via gjson.Valid, ultimately causing the hosting application to encounter a fatal stack overflow error and crash. This vulnerability is addressed in version 3.8.1.

Affected Version(s)

coraza >= 3.0.0, < 3.8.1

References

https://github.com/corazawaf/coraza/security/advisories/G...
x_refsource_CONFIRM
https://github.com/corazawaf/coraza/commit/814e1898e083d2...
x_refsource_MISC
https://github.com/corazawaf/coraza/releases/tag/v3.8.1
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.