SB2026080394 - Multiple vulnerabilities in kin-openapi

Description

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference (CVE-ID: N/A)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to null pointer dereference in openapi3filter.ValidateResponse response header validation when processing a valid OpenAPI specification that declares a response header with content instead of schema. A remote attacker can send a request to an affected operation to cause a denial of service.

The issue affects response-header validation only, and declaring the header is sufficient to trigger the panic on every call to the operation even if the response does not include that header.

2) Excessive Platform Resource Consumption within a Loop (CVE-ID: N/A)

CWE-ID: CWE-1050 - Excessive Platform Resource Consumption within a Loop

CVSSv4: 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]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to excessive platform resource consumption within a loop in openapi3filter/urlValuesDecoder.DecodeObject when processing deepObject-style query parameters during request validation. A remote attacker can send a specially crafted request with many query keys to cause a denial of service.

Only operations with at least one query parameter using the deepObject style are vulnerable, and the resource consumption occurs before any application handler runs.

Remediation

Install update from vendor's website.

References

• https://github.com/getkin/kin-openapi/security/advisories/GHSA-74vm-87hj-r66f
• https://github.com/getkin/kin-openapi/security/advisories/GHSA-h4r5-mxv5-8mjc