actions-runner — security advisory

{
  "id": "8402e2e296e448fabba545e70688d0d0797b1e72dbeaa179e60a1a0f9ccd9d66",
  "url": "https://osv.dev/vulnerability/CGA-8p4w-8r2r-c66h",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CGA-8p4w-8r2r-c66h",
    "summary": "CGA-8p4w-8r2r-c66h",
    "evidence": "osv:CGA-8p4w-8r2r-c66h",
    "products": [
      {
        "name": {
          "value": "actions-runner",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.338.0-r2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CGA-8p4w-8r2r-c66h",
      "aliases": [
        "CGA-8p4w-8r2r-c66h"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.338.0-r2"
                }
              ]
            }
          ],
          "package": {
            "name": "actions-runner",
            "purl": "pkg:apk/chainguard/actions-runner?arch=x86_64",
            "ecosystem": "Chainguard"
          },
          "database_specific": {
            "source": "https://advisories.cgr.dev/chainguard/v3/osv/CGA-8p4w-8r2r-c66h.json"
          },
          "ecosystem_specific": {
            "components": [
              {
                "component_name": "System.Security.Cryptography.Pkcs",
                "component_purl": "pkg:nuget/System.Security.Cryptography.Pkcs@10.0.12",
                "component_type": "dotnet",
                "component_version": "10.0.12",
                "component_location": "/usr/share/actions-runner/bin/Runner.Plugins.deps.json",
                "latest_event_status": "fixed",
                "latest_event_timestamp": "2026-10-14T23:14:33Z"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-15T05:03:29.214809685Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-84008",
        "GHSA-846f-f764-76mx"
      ],
      "references": [
        "https://github.com/dotnet/runtime/security/advisories/GHSA-846f-f764-76mx",
        "https://github.com/dotnet/announcements/issues/468",
        "https://github.com/dotnet/runtime/issues/135703",
        "https://github.com/dotnet/runtime"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-84008",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 319985,
  "published_at": "2026-10-14T13:22:27+00:00"
}