{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-55999","sourceIdentifier":"meissner@suse.de","published":"2026-07-08T09:16:29.800","lastModified":"2026-07-09T19:49:51.483","vulnStatus":"Analyzed","cveTags":[],"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."}],"affected":[{"source":"meissner@suse.de","affectedData":[{"vendor":"X.Org","product":"xorg-server","defaultStatus":"unaffected","packageName":"xorg-server","repo":"https://gitlab.freedesktop.org/xorg/xserver/","versions":[{"version":"0","lessThan":"21.1.24","versionType":"rpm","status":"affected"}]},{"vendor":"X.Org","product":"xwayland","defaultStatus":"unaffected","packageName":"xwayland","repo":"https://gitlab.freedesktop.org/xorg/xserver/","versions":[{"version":"0","lessThan":"24.1.13","versionType":"rpm","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"meissner@suse.de","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":6.0},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-08T00:00:00+00:00","id":"CVE-2026-55999","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"meissner@suse.de","type":"Secondary","description":[{"lang":"en","value":"CWE-122"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*","versionEndExcluding":"21.2.24","matchCriteriaId":"7952D780-B208-4D17-BD47-59B9C820E66F"},{"vulnerable":true,"criteria":"cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*","versionEndExcluding":"24.1.13","matchCriteriaId":"17B539FB-255A-427D-9DD3-659AC3BEE4D4"}]}]}],"references":[{"url":"https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1","source":"meissner@suse.de","tags":["Patch"]},{"url":"https://www.openwall.com/lists/oss-security/2026/07/08/2","source":"meissner@suse.de","tags":["Mailing List","Patch","Third Party Advisory"]}]}}