Important: bubblewrap security update

{
  "id": "46d7c528a5da2b96ed25036b930e11e9700ce6b009b9581b4ae6adf00093cdfb",
  "url": "https://osv.dev/vulnerability/RLSA-2026%3A85309",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Important: bubblewrap security update",
    "summary": "Bubblewrap (/usr/bin/bwrap) is a core execution engine for unprivileged containers that works as a setuid binary on kernels without user namespaces. Security Fix(es): * bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup (CVE-2026-87766) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
    "evidence": "osv:RLSA-2026:85309",
    "products": [
      {
        "name": {
          "value": "bubblewrap",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:0.6.3-1.el9_8.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RLSA-2026:85309",
      "aliases": [
        "RLSA-2026:85309"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:0.6.3-1.el9_8.1"
                }
              ],
              "database_specific": {
                "yum_repository": "BaseOS"
              }
            }
          ],
          "package": {
            "name": "bubblewrap",
            "purl": "pkg:rpm/rocky-linux/bubblewrap?distro=rocky-linux-9&epoch=0",
            "ecosystem": "Rocky Linux:9"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/resf-osv-data/RLSA-2026:85309.json"
          }
        }
      ],
      "modified": "2026-10-21T07:15:06.085459490Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-87766"
      ],
      "references": [
        "https://errata.rockylinux.org/RLSA-2026:85309",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2530542",
        "https://access.redhat.com/errata/RHSA-2026:85309"
      ],
      "provider_metadata": {
        "license": "CC-BY-4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "source_advisory": "RHSA-2026:85309"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-87766",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 391622,
  "published_at": "2026-10-21T06:40:55.719656+00:00"
}