Security advisory

{
  "id": "d2d3f280fba14f72a1873ab918785db1c09ab9d731ad7bef888fcc4e27198b68",
  "url": "https://osv.dev/vulnerability/CVE-2018-15856",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-15856",
    "summary": "An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted keymap files.",
    "evidence": "osv:CVE-2018-15856",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-15856",
      "aliases": [
        "CVE-2018-15856"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/xkbcommon/libxkbcommon",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "87046f56efc89d3b0771df9b4fefcda39ade3dd1"
                },
                {
                  "fixed": "842e4351c2c97de6051cab6ce36b4a81e709a0e1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:xkbcommon:xkbcommon:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "842e4351c2c97de6051cab6ce36b4a81e709a0e1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "xkbcommon-0.8.0",
            "xkbcommon-0.7.2",
            "xkbcommon-0.7.1",
            "xkbcommon-0.7.0",
            "xkbcommon-0.6.1",
            "xkbcommon-0.6.0",
            "xkbcommon-0.5.0",
            "xkbcommon-0.4.3",
            "xkbcommon-0.4.2",
            "xkbcommon-0.4.1",
            "xkbcommon-0.4.0",
            "xkbcommon-0.3.2",
            "xkbcommon-0.3.1",
            "xkbcommon-0.3.0",
            "xkbcommon-0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-15856.json",
            "vanir_signatures": [
              {
                "id": "CVE-2018-15856-4feb5e44",
                "digest": {
                  "length": 2866,
                  "function_hash": "111084396536791922603128660627799779023"
                },
                "source": "https://github.com/xkbcommon/libxkbcommon/commit/842e4351c2c97de6051cab6ce36b4a81e709a0e1",
                "target": {
                  "file": "src/compose/parser.c",
                  "function": "lex"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2018-15856-72580473",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "339976281554706251715786465784200783707",
                    "286489673923724958058425891237163149150",
                    "213471127827195187591013137219067204299",
                    "314939995327740885430641703664042403296"
                  ]
                },
                "source": "https://github.com/xkbcommon/libxkbcommon/commit/842e4351c2c97de6051cab6ce36b4a81e709a0e1",
                "target": {
                  "file": "src/compose/parser.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:35:30Z"
          }
        }
      ],
      "modified": "2026-10-20T13:35:30.988509216Z",
      "provider": "osv",
      "references": [
        "https://access.redhat.com/errata/RHSA-2019:2079",
        "https://security.gentoo.org/glsa/201810-05",
        "https://usn.ubuntu.com/3786-1/",
        "https://usn.ubuntu.com/3786-2/",
        "https://github.com/xkbcommon/libxkbcommon/commit/842e4351c2c97de6051cab6ce36b4a81e709a0e1",
        "https://lists.freedesktop.org/archives/wayland-devel/2018-August/039232.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
              "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
              "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
            ],
            "vendor_product": "canonical:ubuntu_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "14.04"
                  },
                  {
                    "last_affected": "14.04"
                  },
                  {
                    "introduced": "16.04"
                  },
                  {
                    "last_affected": "16.04"
                  },
                  {
                    "introduced": "18.04"
                  },
                  {
                    "last_affected": "18.04"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-15856",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387849,
  "published_at": "2018-08-25T21:29:01.86+00:00"
}