{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-121604", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-03T16:19:16.465Z", "datePublished": "2026-11-03T16:26:55.569Z", "dateUpdated": "2026-11-03T16:26:55.569Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-03T16:26:55.569Z"}, "datePublic": "2026-05-21T00:00:00.000Z", "title": "wlroots before 0.20.2 Out-of-Bounds Read via read_surface_class() in xwm.c", "descriptions": [{"lang": "en", "value": "wlroots before 0.20.2 contains an out-of-bounds read vulnerability in read_surface_class() in xwayland/xwm.c that allows local X11 clients to leak compositor heap memory. Attackers can set a WM_CLASS property with a NUL-terminated instance but unterminated class, exposing over-read heap bytes as the window class or app_id over IPC."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Out-of-bounds Read", "cweId": "CWE-125", "type": "CWE"}]}], "affected": [{"vendor": "wlroots", "product": "wlroots", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "0.20.2", "status": "affected", "versionType": "semver"}], "collectionURL": "https://gitlab.freedesktop.org/wlroots/wlroots", "repo": "https://gitlab.freedesktop.org/wlroots/wlroots"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseScore": 3.3, "baseSeverity": "LOW"}}], "references": [{"url": "https://gitlab.freedesktop.org/wlroots/wlroots/-/work_items/4092", "tags": ["issue-tracking"]}, {"url": "https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5374", "tags": ["issue-tracking"]}, {"url": "https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/851cdd0089004884bd85a95ad21f04009cb5a53a", "tags": ["patch"]}, {"url": "https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/4412992469540b1d578cb94a5cd4e6e5829812dc", "tags": ["patch"]}, {"url": "https://gitlab.freedesktop.org/wlroots/wlroots/-/releases/0.20.2", "tags": ["release-notes"]}, {"url": "https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/0.20.1/xwayland/xwm.c#L661-L678", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: wlroots before 0.20.2 Out-of-Bounds Read via read_surface_class() in xwm.c", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/wlroots-before-0.20.2-out-of-bounds-read-via-read-surface-class-in-xwm-c"}], "credits": [{"lang": "en", "value": "Tristan Madani (Talence Security)", "type": "finder"}, {"lang": "en", "value": "Simon Ser", "type": "remediation developer"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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