libXtst RECORD EnableContext Reply Endless Loop

{
  "id": "36b4f7bea2d46560c1427206ddc1bf4afc4a0d5b53b8316b2cc6c1c7ec64969e",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-109088",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libXtst RECORD EnableContext Reply Endless Loop",
    "summary": "A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.",
    "evidence": "cve:CVE-2026-109088",
    "products": [
      {
        "name": {
          "value": "libXtst",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-109088",
      "aliases": [
        "CVE-2026-109088"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 6.5,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "integrityImpact": "NONE",
            "userInteraction": "REQUIRED",
            "attackComplexity": "LOW",
            "availabilityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "affected": [
        {
          "repo": "https://gitlab.freedesktop.org/xorg/lib/libxtst",
          "vendor": "X.org",
          "product": "libXtst",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.2.6",
              "versionType": "rpm"
            }
          ],
          "packageName": "libXtst",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-27T16:26:20.597Z",
      "provider": "cve",
      "references": [
        "https://gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/11"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
          "shortName": "suse",
          "dateUpdated": "2026-10-27T16:26:20.597Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-109088",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 394463,
  "published_at": "2026-10-27T16:26:20.597+00:00"
}