https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-09-30T10:40:44.919057+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2026-59679 CVE-2026-59679 — fs_read_glyphs() heap OOB read/write via encoding array index mismatch in libXfont2 2026-09-30T10:40:44.970647+00:00

Affected: 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 and 70 more

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. A 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.