{"id":"CVE-2026-59679","state":"PUBLISHED","title":"fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2","description":"fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a size derived from num_extents in the separate FS_QueryXExtents16 reply. The two CARD32 fields are never cross-checked.\nA malicious or compromised font server can send a small num_extents (e.g. 1) in the extents reply, then a large num_chars (e.g. 100000) in the bitmaps reply. This causes attacker-controlled out-of-bounds heap read and writes.","publishedAt":"2026-09-10T08:15:24.892Z","updatedAt":"2026-09-10T12:45:33.969Z","severity":{"score":9.2,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"suse"},"assigner":"suse","products":["SUSE Container suse/kiosk/tigervnc-x11vnc:1.14-63.8","SUSE Container suse/kiosk/xorg:21.1-83.7","SUSE Image SLES15-SP6-SAP","SUSE Image SLES15-SP6-SAP-Azure","SUSE Image SLES15-SP6-SAP-Azure-3P","SUSE Image SLES15-SP6-SAP-BYOS","SUSE Image SLES15-SP6-SAP-BYOS-Azure","SUSE Image SLES15-SP6-SAP-BYOS-EC2","SUSE Image SLES15-SP6-SAP-BYOS-GCE","SUSE Image SLES15-SP6-SAP-EC2","SUSE Image SLES15-SP6-SAP-GCE","SUSE Image SLES15-SP6-SAP-Hardened","SUSE Image SLES15-SP6-SAP-Hardened-Azure","SUSE Image SLES15-SP6-SAP-Hardened-BYOS","SUSE Image SLES15-SP6-SAP-Hardened-BYOS-Azure","SUSE Image SLES15-SP6-SAP-Hardened-BYOS-EC2","SUSE Image 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Tumbleweed","packageName":"libXfont2-2","defaultStatus":"unaffected","versions":[{"version":"?","status":"affected","lessThan":"2.0.7-3.1","versionType":"custom"}]},{"vendor":"SUSE","product":"openSUSE Tumbleweed","packageName":"libXfont2-2-32bit","defaultStatus":"unaffected","versions":[{"version":"?","status":"affected","lessThan":"2.0.7-3.1","versionType":"custom"}]},{"vendor":"SUSE","product":"openSUSE Tumbleweed","packageName":"libXfont2-devel","defaultStatus":"unaffected","versions":[{"version":"?","status":"affected","lessThan":"2.0.7-3.1","versionType":"custom"}]},{"vendor":"SUSE","product":"openSUSE 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heap OOB read/write via encoding array index mismatch in libXfont2","descriptions":[{"lang":"en","value":"fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) indexes the per-character encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a size derived from num_extents in the separate FS_QueryXExtents16 reply. The two CARD32 fields are never cross-checked.\nA malicious or compromised font server can send a small num_extents (e.g. 1) in the extents reply, then a large num_chars (e.g. 100000) in the bitmaps reply. This causes attacker-controlled out-of-bounds heap read and writes."}],"affected":[{"vendor":"SUSE","product":"Container suse/kiosk/tigervnc-x11vnc:1.14-63.8","packageName":"libXfont2-2","defaultStatus":"unaffected","versions":[{"version":"?","status":"affected","lessThan":"2.0.3-150000.3.6.1","versionType":"custom"}]},{"vendor":"SUSE","product":"Container suse/kiosk/xorg:21.1-83.7","packageName":"libXfont2-2","defaultStatus":"unaffected","versions":[{"version":"?","status":"affected","lessThan":"2.0.3-150000.3.6.1","versionType":"custom"}]},{"vendor":"SUSE","product":"Image SLES15-SP6-SAP","packageName":"libXfont2-2","defaultStatus":"unaffected","versions":[{"version":"?","status":"affected","lessThan":"2.0.3-150000.3.6.1","versionType":"custom"}]},{"vendor":"SUSE","product":"Image 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