getkin kin-openapi up to 0.145.x DeepObject Decoder urlValuesDecoder.DecodeObject allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in getkin kin-openapi up to 0.145.x. This affects the function urlValuesDecoder.DecodeObject of the component DeepObject Decoder. The manipulation results in allocation of resources. This vulnerability was named CVE-2026-100350. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in getkin kin-openapi up to 0.145.x. Affected is the function urlValuesDecoder.DecodeObject of the component DeepObject Decoder. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

kin-openapi is a Go project for handling OpenAPI files. From 0.145.0 until 0.146.0, openapi3filter repeatedly calls regexp.MustCompile for the same parameter-name regular expression inside the per-query-key loop in urlValuesDecoder.DecodeObject used to decode a deepObject query parameter. An unauthenticated remote client can send an affected endpoint a request containing many unrelated query keys, causing ValidateRequest to perform work and allocations proportional to the attacker-controlled key count for every deepObject parameter. The expression itself is fixed and this is not regular expression denial of service; the resource consumption comes from loop-invariant recompilation. This issue is fixed in version 0.146.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-100350 since 09/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 0.146.0 eliminates this vulnerability.

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Productinfo

Vendor

• getkin

Name

• kin-openapi

Version

• 0.145

Website

• Product: https://github.com/getkin/kin-openapi/

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