Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser

{
  "id": "49db8f19623f74392dabb990f82a0d071e48769bfccaf538fb0d800a43ce5082",
  "url": "https://osv.dev/vulnerability/CVE-2026-94283",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser",
    "summary": "An out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.",
    "evidence": "osv:CVE-2026-94283",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-94283",
      "aliases": [
        "CVE-2026-94283"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.freedesktop.org/xorg/lib/libx11",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b8d5a7046a98a244ee8ca3c9c07fd617c800dde2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.8.14"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "libX11-1.8.13",
            "libX11-1.8.12",
            "libX11-1.8.11",
            "libX11-1.8.10",
            "libX11-1.8.9",
            "libX11-1.8.8",
            "libX11-1.8.7",
            "libX11-1.8.6",
            "libX11-1.8.5",
            "libX11-1.8.4",
            "libX11-1.8.3",
            "libX11-1.8.2",
            "libX11-1.8.1",
            "libX11-1.8",
            "libX11-1.7.5",
            "libX11-1.7.4",
            "libX11-1.7.3.1",
            "libX11-1.7.3",
            "libX11-1.7.2",
            "libX11-1.7.1",
            "libX11-1.7.0",
            "libX11-1.6.12",
            "libX11-1.6.11",
            "libX11-1.6.10",
            "libX11-1.6.9",
            "libX11-1.6.8",
            "libX11-1.6.7",
            "libX11-1.6.6",
            "libX11-1.6.5",
            "libX11-1.6.4",
            "libX11-1.6.3",
            "libX11-1.6.2",
            "libX11-1.6.1",
            "libX11-1.6.0",
            "libX11-1.5.99.902",
            "libX11-1.5.99.901",
            "libX11-1.5.0",
            "libX11-1.4.99.902",
            "libX11-1.4.99.901",
            "libX11-1.4.99.1",
            "libX11-1.4.4",
            "libX11-1.4.3",
            "libX11-1.4.2",
            "libX11-1.4.1",
            "libX11-1.4.0",
            "libX11-1.3.99.903",
            "libX11-1.3.99.902",
            "libX11-1.3.99.901",
            "libX11-1.3.4",
            "libX11-1.3.3",
            "libX11-1.3.2",
            "libX11-1.3.1",
            "libX11-1.3",
            "libX11-1.2.99.901",
            "libX11-1.2.2",
            "libX11-1.2.1",
            "libX11-1.2",
            "libX11-1.1.99.2",
            "libX11-1.1.4",
            "libX11-1.1.3",
            "libX11-1.1.2",
            "XORG-6_99_99_904",
            "MODULAR_COPY",
            "XORG-6_99_99_903",
            "XORG-6_8_99_903",
            "XORG-6_99_99_902",
            "XORG-6_8_99_902",
            "XORG-6_99_99_901",
            "XORG-6_8_99_901",
            "XORG-6_99_99_900",
            "XORG-6_8_99_900",
            "XORG-6_8_99_15",
            "XORG-6_8_99_14",
            "XORG-6_8_99_13",
            "XORG-6_8_99_10",
            "XORG-6_8_99_9",
            "XORG-6_8_99_7",
            "XORG-6_8_99_6",
            "XORG-6_8_1",
            "XORG-6_7_99_903",
            "XORG-6_7_99_902",
            "XORG-6_7_99_2",
            "XORG-6_7_99_1",
            "XACE-SELINUX-MERGE",
            "XORG-MAIN"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-94283.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.570577212Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/94xxx/CVE-2026-94283.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-94283",
        "https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=42d0303f243002a9856c76060569a61893c670dd",
        "https://gitlab.freedesktop.org/xorg/lib/libx11"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "suse",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/94xxx/CVE-2026-94283.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-94283",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495422,
  "published_at": "2026-09-28T08:34:14.23+00:00"
}