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CVE-2026-59679 is an out-of-bounds memory access vulnerability in the libXfont2 font-server client, affecting versions prior to 2.0.9. The flaw is in fs_read_glyphs() in src/fc/fserve.c, where the per-character encoding[] array is indexed using num_chars from an FS_QueryXBitmaps16 reply even though the array was allocated based on num_extents from a separate FS_QueryXExtents16 reply. Because these two values are not cross-checked, a malicious font server can induce a size mismatch by supplying a small num_extents value followed by a larger num_chars value. This can trigger out-of-bounds heap reads during metric handling and out-of-bounds writes when storing glyph bitmap pointers in the encoding[] entries. The issue was attributed to an incomplete fix for CVE-2014-0210.
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