Skip to main content

Python Pillow CVE-2026-59197

| EUVDEUVD-2026-43734 HIGH
Out-of-bounds Write (CWE-787)
2026-07-14 GitHub_M GHSA-xj96-63gp-2gmr
Python Buffer Overflow Memory Corruption Pillow Red Hat Suse
8.2
CVSS 3.1 · Vendor: GitHub_M
Share

Severity by source

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

Network-reachable only where the app exposes filter size to untrusted input, so AC:H; no auth at Pillow level (PR:N); crash-dominant (A:H) with limited memory-write integrity impact (I:L) and no confidentiality loss.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
6.8 MEDIUM
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Red Hat
8.2 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
Low
Availability
High

Lifecycle Timeline

4
Patch available
Jul 14, 2026 - 18:20 EUVD
Source Code Evidence Fetched
Jul 14, 2026 - 17:00 vuln.today
Analysis Generated
Jul 14, 2026 - 17:00 vuln.today
CVE Published
Jul 14, 2026 - 16:25 cve.org
HIGH 8.2

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 90,002 pypi packages depend on pillow (19,822 direct, 71,639 indirect)

Ecosystem-wide dependent count for version 12.3.0.

DescriptionCVE.org

Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.

Articles & Coverage 1

News 14 New Python Vulnerabilities - 14 High Severity, 1 With POC Jul 15, 2026

AnalysisAI

Heap out-of-bounds write in Python Pillow prior to 12.3.0 lets an attacker who controls the rank-filter size parameter corrupt native heap memory and crash or potentially manipulate the process. ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before validating the filter size, and the native ImagingExpand() routine computes output dimensions using unchecked signed-int arithmetic, so a very large odd size overflows and drives an out-of-bounds write (CWE-787). No public exploit is identified at time of analysis; the flaw is fixed in Pillow 12.3.0.

Technical ContextAI

Pillow is the dominant Python imaging library (a maintained fork of PIL) used for loading, transforming, and filtering images across web apps, ML pipelines, and desktop tooling. The defect lives in the C acceleration layer (src/libImaging/Filter.c): ImagingExpand(imIn, margin) grows an image by a margin equal to size // 2 to accommodate the rank filter's neighborhood, then allocates and writes an expanded buffer. Output dimensions and the allocation size are derived from margin * margin * sizeof(FLOAT32) using signed 32-bit int math with no overflow guard, so a large margin wraps past INT_MAX and yields an undersized allocation relative to the write loop - a classic CWE-787 out-of-bounds write. Because the Python-level RankFilter.__init__ performed no upper-bound check on size before reaching native code, the guard could be bypassed entirely. The fix adds two independent checks: a Python-side 'size * size * 4 > 2**31-1' rejection in ImageFilter.py and a native 'margin > INT_MAX / (margin * sizeof(FLOAT32))' guard in Filter.c, both raising 'filter size too large'.

RemediationAI

Vendor-released patch: upgrade Pillow to 12.3.0 or later (pip install --upgrade 'Pillow>=12.3.0'), which adds bounds validation in both ImageFilter.py and the native ImagingExpand() path; see the advisory at https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmr and the tagged release https://github.com/python-pillow/Pillow/releases/tag/12.3.0. If you cannot upgrade immediately, the effective compensating control is to ensure the rank-filter size is never derived from untrusted input: hard-code or clamp the size argument to RankFilter, MedianFilter, MinFilter, and MaxFilter (for example reject any size where size*size*4 exceeds 2**31-1, mirroring the upstream check) at the application boundary before the value reaches Pillow. The trade-off is minimal since legitimate rank-filter sizes are tiny; the only side effect is rejecting the abnormally large sizes that legitimate image processing never uses.

More in Python

View all
CVE-2025-24016 CRITICAL POC
9.9 Feb 10

Wazuh SIEM platform versions 4.4.0 through 4.9.0 contain an unsafe deserialization vulnerability in the DistributedAPI t
CVE-2025-27520 CRITICAL POC
9.8 Apr 04

BentoML version 1.4.2 and earlier contains an unauthenticated remote code execution vulnerability through insecure deser
CVE-2025-2945 CRITICAL POC
9.9 Apr 03

pgAdmin 4 contains critical remote code execution vulnerabilities in the Query Tool download and Cloud Deployment endpoi
CVE-2013-5093 MEDIUM POC
6.8 Sep 27

The renderLocalView function in render/views.py in graphite-web in Graphite 0.9.5 through 0.9.10 uses the pickle Python

CVE-2025-32375 CRITICAL POC
9.8 Apr 09

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Rated critica
CVE-2014-0224 HIGH POC
7.4 Jun 05

OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h does not properly restrict processing of ChangeCiph
CVE-2024-21644 HIGH POC
7.5 Jan 08

pyLoad download manager version prior to 0.5.0b3.dev77 exposes the Flask SECRET_KEY through an unauthenticated endpoint.
CVE-2026-33017 CRITICAL POC
9.3 Mar 17

Langflow (a visual LLM pipeline builder) contains a critical unauthenticated code execution vulnerability (CVE-2026-3301
CVE-2017-9462 HIGH POC
8.8 Jun 06

In Mercurial before 4.1.3, "hg serve --stdio" allows remote authenticated users to launch the Python debugger, and conse
CVE-2026-39987 CRITICAL POC
9.3 Apr 08

Unauthenticated remote code execution in Marimo ≤0.20.4 allows attackers to execute arbitrary system commands via the `/
CVE-2024-21645 MEDIUM POC
5.3 Jan 08

pyLoad is the free and open-source Download Manager written in pure Python. Rated medium severity (CVSS 5.3), this vulne
CVE-2026-55255 HIGH POC
8.4 Jun 19

Cross-user flow execution in Langflow (< 1.9.1) lets any authenticated API-key holder run another user's flow by passing

Same weakness CWE-787 – Out-of-bounds Write

View all
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2012-1889 HIGH POC
8.8
CVE-2010-3333 HIGH POC
7.8
CVE-2014-1761 HIGH POC
7.8
CVE-2009-3129 HIGH POC
7.8
CVE-2021-1732 HIGH POC
7.8
CVE-2013-3346 CRITICAL POC
9.8

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

Share

CVE-2026-59197 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy