CVE-2026-100350
kin-openapi deepObject query decoding repeatedly compiles an invariant regular expression
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/getkin/kin-openapi | >= 0.145.0, < 0.146.0 | 0.146.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-h4r5-mxv5-8mjc
- https://github.com/getkin/kin-openapi/security/advisories/GHSA-h4r5-mxv5-8mjc
- https://nvd.nist.gov/vuln/detail/CVE-2026-100350
- https://github.com/getkin/kin-openapi/commit/d090e36b2f1c42c898ba2a687a8f6e25f5ca727f
- https://github.com/getkin/kin-openapi/releases/tag/v0.146.0