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Python Pillow CVE-2026-54060

| EUVDEUVD-2026-41900 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-07-06 GitHub_M GHSA-5x94-69rx-g8h2 PYSEC-2026-2254
Python Information Disclosure Red Hat Pillow Suse Python Pillow
7.5
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Network-reachable unauthenticated font input (AV:N/PR:N/UI:N) causes memory-exhaustion DoS only, so A:H with C:N/I:N; AC:L as a single crafted font suffices.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Patch available
Jul 06, 2026 - 20:02 EUVD
Analysis Generated
Jul 06, 2026 - 19:34 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 91,751 pypi packages depend on pillow (19,971 direct, 73,306 indirect)

Ecosystem-wide dependent count for version 12.3.0.

DescriptionCVE.org

Pillow is a Python imaging library. Prior to 12.3.0, PIL/FontFile.py FontFile.compile() assembled per-glyph images into a combined bitmap with Image.new("1", (xsize, ysize)) without calling Image._decompression_bomb_check(), allowing a font to trigger excessive allocation during conversion or saving. This issue is fixed in version 12.3.0.

Articles & Coverage 1

News 9 New Python Vulnerabilities - 2 Critical, 7 High, 2 With POC Jul 07, 2026

AnalysisAI

Uncontrolled memory allocation in Python Pillow before 12.3.0 allows a maliciously crafted font file to trigger excessive memory consumption and denial of service when its glyphs are compiled into a combined bitmap. FontFile.compile() builds the output image via Image.new("1", (xsize, ysize)) without invoking Pillow's decompression-bomb guard, so oversized glyph dimensions are allocated unchecked during conversion or saving. There is no public exploit identified at time of analysis, and it is not listed in CISA KEV; the availability-only impact (CVSS 7.5) reflects resource exhaustion rather than code execution or data disclosure.

Technical ContextAI

Pillow (PIL fork) is the de-facto Python imaging library, used across web backends, document/thumbnail pipelines, and any service that renders or converts fonts and images. The flaw lives in PIL/FontFile.py, in the FontFile.compile() routine that assembles per-glyph bitmaps into one combined image using Image.new("1", (xsize, ysize)). Pillow normally routes large allocations through Image._decompression_bomb_check() to reject images whose pixel count exceeds MAX_IMAGE_PIXELS, but this code path skipped that guard. This maps to CWE-789 (Memory Allocation with Excessive Size Value): attacker-influenced xsize/ysize values derived from font metrics drive an unbounded allocation. The affected component is the bitmap font handling (e.g., BDF/PCF-style font compilation), not general JPEG/PNG decoding.

RemediationAI

Vendor-released patch: upgrade to Pillow 12.3.0 or later (pip install --upgrade 'Pillow>=12.3.0'), which adds the missing Image._decompression_bomb_check() call in FontFile.compile(); see advisory GHSA-5x94-69rx-g8h2 and release notes for 12.3.0. Where immediate upgrade is not possible, do not pass untrusted or user-supplied bitmap font files into FontFile/ImageFont compilation paths, and validate/limit font glyph dimensions before processing. As a compensating control you can lower PIL.Image.MAX_IMAGE_PIXELS and ensure your code does not suppress the resulting DecompressionBombError, and apply per-process memory limits (e.g., cgroup/ulimit) so an oversized allocation is bounded and the worker is killed rather than exhausting host memory - the trade-off is that legitimate very-large fonts may be rejected and worker restarts add latency. Refer to https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d for the exact change.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed
openSUSE Tumbleweed Fixed

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CVE-2026-54060 vulnerability details – vuln.today
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