Is CVE-2026-54059 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-54059?

CVE-2026-54059 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-54059

Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation. This issue is fixed in version 12.3.0.