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High, CVSS 7.5amended

kin-openapi: Incomplete Fix for GHSA-p6wj-qrr4-pgh5: Three Unpatched nil-Items Panic Paths in openapi3filter

CVE-2026-100353GHSA-vrcc-3ch7-hppw

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/getkin/kin-openapi 0.149.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-100353: 0.34% estimated exploitation activity in the next 30 days; percentile 26.89 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The fix for GHSA-p6wj-qrr4-pgh5 addressed a nil-pointer dereference that occurs when an OpenAPI 3.1 array schema omits the items keyword (which is legal under JSON Schema 2020-12). That fix patched three decoder paths: the standalone parseArray function, the top-level array check in UrlencodedBodyDecoder, and MultipartBodyDecoder. Three additional crash paths were missed. All of them reach the unguarded urlValuesDecoder.parseArray method (openapi3filter/reqrespdecoder.go:576) or the unguarded array branch in buildResObj (line 1015): 1. Query parameters with type: array and no items. 2. deepObject query parameters containing an array property with no items. 3. URL-encoded request bodies where the array lives inside an allOf / anyOf / oneOf sub-schema. This path bypasses the guard added by the GHSA-p6wj-qrr4-pgh5 fix, because that guard only inspects top-level properties. Each path is triggerable by an unauthenticated client and produces a deterministic nil-pointer panic during…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-vrcc-3ch7-hppw

  2. Revision 1 · created ·

    Published from osv record GHSA-vrcc-3ch7-hppw

Agent brief

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# Patch Next advisory brief: CVE-2026-100353

Advisory: kin-openapi: Incomplete Fix for GHSA-p6wj-qrr4-pgh5: Three Unpatched nil-Items Panic Paths in openapi3filter
IDs: CVE-2026-100353, GHSA-vrcc-3ch7-hppw
Record: https://patchnext.com/advisories/cve-2026-100353 (revision 2, source checked 26 Oct 2026, 15:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/getkin/kin-openapi 0.149.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/getkin/kin-openapi: affected >= 0.136.0, < 0.149.0; fixed in 0.149.0

## Suggested inspection (read-only)
- Go github.com/getkin/kin-openapi: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/getkin/kin-openapi.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-vrcc-3ch7-hppw (OSV record GHSA-vrcc-3ch7-hppw lists affected ranges: Go github.com/getkin/kin-openapi >=0.136.0 <0.149.0 (fixed))
- Verified: https://github.com/advisories/GHSA-vrcc-3ch7-hppw (GitHub-reviewed advisory GHSA-vrcc-3ch7-hppw lists affected ranges: Go github.com/getkin/kin-openapi >=0.136.0 <0.149.0)

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