CVE-2026-55379: Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimension

highCVSS 7.5CVE-2026-55379

Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing excessive memory allocation. This issue is fixed in version 12.3.0.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.5
Published: 2026-07-06
Last updated: 2026-07-07
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55379

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-553790.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55379	coverage & exploitation status	NVD · CVE.org

Recent advisories for Pillow is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Red Hat Satellite (foreman, python-pillow, go): Multiple vulnerabilitiescert-bund · 2026-07-10
mediumCVE-2026-55798: Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a…nvd · 2026-07-06
highCVE-2026-55380: Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() re…nvd · 2026-07-06
highCVE-2026-54060: Pillow is a Python imaging library. Prior to 12.3.0, PIL/FontFile.py FontFile.compile() assemb…nvd · 2026-07-06
highCVE-2026-54059: Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read g…nvd · 2026-07-06
unknownDSA-6357-1 pillow - security updatedebian · 2026-06-21

CVE-2026-55379: Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimension

Details

Exploitation outlook

Referenced CVEs

Recent advisories for Pillow is a

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