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{"bugzilla": {"description": "libX11: libX11: Heap-based buffer overflow via malicious X server", "id": "2538514", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538514"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.", "A flaw was found in libX11. A heap-based buffer overflow vulnerability exists during the handling of XkbGetMap replies. A remote attacker, by operating a malicious X server, could exploit this flaw to potentially execute arbitrary code or cause a denial of service on the client system. User interaction is required for exploitation."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, users should avoid connecting to untrusted X servers. When using SSH, ensure that X11 forwarding (`ssh -X` or `ssh -Y`) is only enabled for trusted remote hosts. To prevent X11 forwarding for specific hosts, add `ForwardX11 no` to the relevant host entry in `~/.ssh/config` or `/etc/ssh/ssh_config`. Alternatively, disable X11 forwarding globally by setting `ForwardX11 no` in `/etc/ssh/ssh_config`."}, "name": "CVE-2026-88806", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "libX11", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "libX11", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "libX11", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "libX11", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "libX11", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "libX11", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-21T13:42:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88806\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88806\nhttps://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309"], "threat_severity": "Important"}

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