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CVE-2026-44950 is a heap-based buffer overflow 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, which copies glyph bitmap data into a single heap buffer allocated to rep->nbytes bytes. The implementation validates each individual source slice against the source bitmap buffer, but does not verify that the cumulative destination writes remain within the bounds of the allbits allocation. A malicious font server can exploit this by supplying overlapping or otherwise crafted source offsets such that each per-glyph copy appears individually valid while the aggregate writes overflow the destination heap buffer. The overflow is attacker-controlled in both content and size and stems from an incomplete fix for CVE-2014-0210.
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Cross-references every affected SKU, including bundled OEM variants.
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