GHSA-M7HM-VM4X-28JF

Vulnerability from github – Published: 2026-05-04 21:25 – Updated: 2026-05-13 13:42
VLAI?
Summary
apko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery
Details

DiscoverKeys in pkg/apk/apk/implementation.go unconditionally type-asserts JWKS keys as *rsa.PublicKey without checking the key type. If a repository JWKS endpoint returns a non-RSA key (e.g. EC), the unchecked assertion panics and crashes apko. This affects any workflow that initializes the APK database and fetches repository keys. Affected versions <= 0.30.34.

Fix: No fix available yet.

Acknowledgements

apko thanks Oleh Konko from 1seal for discovering and reporting this issue.

Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "chainguard.dev/apko"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42576"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-704"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-04T21:25:30Z",
    "nvd_published_at": "2026-05-09T20:16:29Z",
    "severity": "MODERATE"
  },
  "details": "`DiscoverKeys` in `pkg/apk/apk/implementation.go` unconditionally type-asserts JWKS keys as `*rsa.PublicKey` without checking the key type. If a repository JWKS endpoint returns a non-RSA key (e.g. EC), the unchecked assertion panics and crashes apko. This affects any workflow that initializes the APK database and fetches repository keys. Affected versions \u003c= 0.30.34.\n\n**Fix:** No fix available yet.\n\n**Acknowledgements**\n\napko thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.",
  "id": "GHSA-m7hm-vm4x-28jf",
  "modified": "2026-05-13T13:42:36Z",
  "published": "2026-05-04T21:25:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/chainguard-dev/apko/security/advisories/GHSA-m7hm-vm4x-28jf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42576"
    },
    {
      "type": "WEB",
      "url": "https://github.com/chainguard-dev/apko/commit/6604826b19e36e9bc6e196592800fad93738f4a1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/chainguard-dev/apko"
    },
    {
      "type": "WEB",
      "url": "https://github.com/chainguard-dev/apko/releases/tag/v1.2.7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "apko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery"
}


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