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  4. CVE 2026 100351 kin openapi validationhandler security
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Back to active CVEs
High · CVSS 7.4CVE-2026-100351

kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusionCVE-2026-100351

Answer in brief

CVE-2026-100351 records a High severity (CVSS 7.4) vulnerability in kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion. The current sources do not mark it as known exploited. The current feed maps getkin/kin-openapi (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2026Updated Oct 15, 2026Source checked Oct 15, 2026First seen by HOL Oct 15, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps getkin/kin-openapi (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
getkin/kin-openapigeneric>=0.144.0 <0.147.00.147.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for getkin/kin-openapi.
  2. 2Review the reported fix. Update getkin/kin-openapi to 0.147.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 15, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

kin-openapi is a Go project for handling OpenAPI files. From 0.144.0 until 0.147.0, openapi3filter.ValidationHandler validates an operation selected from decoded URL.Path while a downstream gorilla/mux router configured with UseEncodedPath can dispatch a different operation selected from URL.RawPath. When a public exact route and a protected parameterized route use the same method and overlap after decoding, an unauthenticated remote request containing an encoded path separator can be validated as public and then dispatched to the protected handler without invoking the configured AuthenticationFunc. The reachable path parameter is constrained to an encoded representation that decodes to the public literal route, and proxies that canonicalize the URI before forwarding prevent this specific mismatch. This issue is fixed in version 0.147.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static pathSame getkin/kin-openapi package
  • kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointer DoS)Same getkin/kin-openapi package
  • kin-openapi openapi3filter: nil-pointer panic in ValidateResponse on a response header declared with contentSame getkin/kin-openapi package
  • kin-openapi deepObject query decoding repeatedly compiles an invariant regular expressionSame getkin/kin-openapi package
  • kin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation PathSame getkin/kin-openapi package
  • kin-openapi: Incomplete Fix for GHSA-p6wj-qrr4-pgh5: Three Unpatched nil-Items Panic Paths in openapi3filterSame getkin/kin-openapi package

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-289, CWE-436
Source
CVE List V5
Source checked
Oct 15, 2026
References
3 linked sources
Open source record