{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55999","assignerOrgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","state":"PUBLISHED","assignerShortName":"suse","dateReserved":"2026-06-18T09:26:55.988Z","datePublished":"2026-07-08T08:07:11.088Z","dateUpdated":"2026-07-09T03:55:43.683Z"},"containers":{"cna":{"providerMetadata":{"orgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","shortName":"suse","dateUpdated":"2026-07-08T08:12:17.088Z"},"title":"xorg-server / xwayland glamor font atlas Heap Buffer Overflow","datePublic":"2026-07-08T07:51:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-122","description":"CWE-122 Heap-based buffer overflow","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-234","descriptions":[{"lang":"en","value":"CAPEC-234 Hijacking a privileged process"}]}],"affected":[{"vendor":"X.Org","product":"xorg-server","packageName":"xorg-server","repo":"https://gitlab.freedesktop.org/xorg/xserver/","versions":[{"status":"affected","version":"0","lessThan":"21.1.24","versionType":"rpm"}],"defaultStatus":"unaffected"},{"vendor":"X.Org","product":"xwayland","packageName":"xwayland","repo":"https://gitlab.freedesktop.org/xorg/xserver/","versions":[{"status":"affected","version":"0","lessThan":"24.1.13","versionType":"rpm"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"Local attackers with a X connection able to provide PCX fonts to the X \nserver xorg-server before 21.2.24 and xwayland before 24.1.13 could \ncause a heap buffer overflow via SetFont due to missing glyph boundary checks.","supportingMedia":[{"type":"text/html","base64":false,"value":"Local attackers with a X connection able to provide PCX fonts to the X \nserver xorg-server before 21.2.24 and xwayland before 24.1.13 could \ncause a heap buffer overflow via SetFont due to missing glyph boundary checks."}]}],"references":[{"url":"https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1","tags":["patch"]},{"url":"https://www.openwall.com/lists/oss-security/2026/07/08/2","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":8.5,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"}}],"credits":[{"lang":"en","value":"Anonymous working with Trend Micro Zero Day Initiative.","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-08T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-55999"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-09T03:55:43.683Z"}}]}}