Important: libX11 security update

{
  "id": "91358f3ed10ace687e87b21d181d101c2a9a59f339d2a4c1bb2434c098b5813c",
  "url": "https://osv.dev/vulnerability/RLSA-2026%3A89730",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Important: libX11 security update",
    "summary": "The libX11 packages contain the core X11 protocol client library. Security Fix(es): * libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806) 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-2026:89730",
    "products": [
      {
        "name": {
          "value": "libX11",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:1.6.8-10.el8_10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RLSA-2026:89730",
      "aliases": [
        "RLSA-2026:89730"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:1.6.8-10.el8_10"
                }
              ],
              "database_specific": {
                "yum_repository": "AppStream"
              }
            }
          ],
          "package": {
            "name": "libX11",
            "purl": "pkg:rpm/rocky-linux/libX11?distro=rocky-linux-8&epoch=0",
            "ecosystem": "Rocky Linux:8"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/resf-osv-data/RLSA-2026:89730.json"
          }
        }
      ],
      "modified": "2026-10-27T12:30:02.538887873Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-88806"
      ],
      "references": [
        "https://errata.rockylinux.org/RLSA-2026:89730",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2538514",
        "https://access.redhat.com/errata/RHSA-2026:89730"
      ],
      "provider_metadata": {
        "license": "CC-BY-4.0",
        "license_url": "https://creativecommons.org/licenses/by/4.0/",
        "source_advisory": "RHSA-2026:89730"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-88806",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 461519,
  "published_at": "2026-10-27T12:01:24.400471+00:00"
}