{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-88806", "assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "state": "PUBLISHED", "assignerShortName": "suse", "dateReserved": "2026-09-10T08:35:07.010Z", "datePublished": "2026-09-21T13:42:12.700Z", "dateUpdated": "2026-09-22T03:55:48.003Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb", "shortName": "suse", "dateUpdated": "2026-09-21T13:42:12.700Z" }, "title": "libX11 XkbGetMap Reply Heap-based Buffer Overflow", "datePublic": "2026-09-18T13:33:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-122", "description": "CWE-122 Heap-based buffer overflow", "type": "CWE" } ] } ], "impacts": [ { "capecId": "CAPEC-242", "descriptions": [ { "lang": "en", "value": "CAPEC-242 Code Injection" } ] } ], "affected": [ { "vendor": "x.org", "product": "libX11", "packageName": "libX11", "repo": "https://gitlab.freedesktop.org/xorg/lib/libx11", "versions": [ { "status": "affected", "version": "0", "lessThan": "1.8.14", "versionType": "semver" } ], "defaultStatus": "unaffected" } ], "cpeApplicability": [ { "operator": "OR", "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "1.8.14" } ] } ] } ], "descriptions": [ { "lang": "en", "value": "A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "
A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.
" } ] } ], "references": [ { "url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309", "tags": [ "patch" ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H" } } ], "credits": [ { "lang": "en", "value": "Adam Bedard working with TrendAI Zero Day Initiative", "type": "finder" }, { "lang": "en", "value": "Claude:claude-opus-4-6", "type": "tool" } ], "source": { "discovery": "EXTERNAL" }, "x_generator": { "engine": "Vulnogram 1.0.5" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-09-21T00:00:00+00:00", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-88806" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-22T03:55:48.003Z" } } ] } }