NULL pointer dereference in kin-openapi - CVE-2026-73502
Published: July 30, 2026 / Updated: August 19, 2026
Vulnerability identifier: #VU140573
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73502
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in openapi3filter.ValidateRequest and defaultContentParameterDecoder when validating a request against a content parameter whose media type has no schema. A remote attacker can send a single crafted HTTP request to cause a denial of service.
The issue is reachable when request validation is performed for an operation that declares a content parameter without a schema, and the consequence ranges from aborting the current request to crashing the whole process depending on how the library is integrated.
Affected software
kin-openapi
How to mitigate CVE-2026-73502
Install security update from vendor's website.
kin-openapi - update to 0.144.0