---
id: CVE-2026-89316
title: >-
  LoadPublicKey panics on kty/alg mismatch (kty=EC with a non-EC alg) via
  unchecked *ECDSAOptions type assertion
summary: >-
  `LoadPublicKey` resolved an EC key's curve with an unchecked type assertion,
  `algToOptsMap[alg].(*ECDSAOptions)`. A JWK declaring `"kty":"EC"` together
  with a non-EC `"alg"` — which RFC 7517 §4.4 permits — reaches that assertion
  and **pa…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-248
vendor: Eclipse Foundation
product: github.com/ThalesGroup/gose
affected:
  - github.com/ThalesGroup/gose >= 0.7.3 <= 0.13.0-rc1
  - github.com/eclipse-keypont/gose < 1.0.0-rc4
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T08:48:08.682Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89316'
references:
  - url: >-
      https://github.com/eclipse-keypont/gose/security/advisories/GHSA-fv39-8484-f4wr
tags:
  - cve.org
ingestedAt: '2026-10-23T09:20:44.059Z'
---

## Overview

`LoadPublicKey` resolved an EC key's curve with an unchecked type assertion, `algToOptsMap[alg].(*ECDSAOptions)`. A JWK declaring `"kty":"EC"` together with a non-EC `"alg"` — which RFC 7517 §4.4 permits — reaches that assertion and **panics**.

## Affected

- `github.com/ThalesGroup/gose >= 0.7.3 <= 0.13.0-rc1`
- `github.com/eclipse-keypont/gose < 1.0.0-rc4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.