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HIGH

CVE-2026-76905

kin-openapi openai3filter: nil-pointer panic in ConvertErrors on malformed multipart/form-data body enables unauthenticated DoS

CVSS v3

7.5

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-10-16

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • github.com/getkin/kin-openapiGofrom 0.10.0 · fixed in 0.141.0

Vendor advisories

  • CVE-2026-76905 Red Hat Product Security2 products fixed · 65 known affected

    github.com/getkin/kin-openapi: kin-openapi: Denial of Service via malformed multipart/form-data body

    mta/mta-hub-rhel9 as a component of Migration Toolkit for Applications 8 · multicluster-globalhub/multicluster-globalhub-grafana-rhel9 as a component of Multicluster Global Hub · openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel9 as a component of OpenShift Serverless

Full record on NVD

Description

kin-openapi is a Go project for handling OpenAPI files. From 0.10.0 until 0.141.0, openapi3filter.convertParseError in openapi3filter/validation_error_encoder.go dereferences e.Parameter.In without checking whether e.Parameter is nil. A malformed non-string scalar field in a multipart/form-data request body produces a nested ParseError with a nil RequestError.Parameter, and applications that render the validation error through openapi3filter.ConvertErrors or ValidationErrorEncoder panic. An unauthenticated client can repeatedly send such requests to deny service when the application lacks a recovery boundary. JSON request bodies and applications that do not use these error-rendering helpers are not affected. This issue is fixed in version 0.141.0.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-08-21
Last Modified
2026-08-21

Frequently asked questions

What is CVE-2026-76905?

kin-openapi is a Go project for handling OpenAPI files. From 0.10.0 until 0.141.0, openapi3filter.convertParseError in openapi3filter/validation_error_encoder.go dereferences e.Parameter.In without checking whether e.Parameter is nil. A malformed non-string scalar field in a multipart/form-data request body produces a nested ParseError with a nil RequestError.Parameter, and applications that render the validation error through openapi3filter.ConvertErrors or ValidationErrorEncoder panic. An unauthenticated client can repeatedly send such requests to deny service when the application lacks a recovery boundary. JSON request bodies and applications that do not use these error-rendering helpers are not affected. This issue is fixed in version 0.141.0.

Is CVE-2026-76905 actively exploited?

Active exploitation of CVE-2026-76905 has not been confirmed. Its EPSS score was 0.6% on 2026-10-16, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-76905?

CVE-2026-76905 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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