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Python Pillow CVE-2026-59204

| EUVDEUVD-2026-43730 HIGH
Memory Allocation with Excessive Size Value (CWE-789)
2026-07-14 GitHub_M
Python Information Disclosure Pillow
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Untrusted image reaches the decoder over the network with no auth or interaction (AV:N/AC:L/PR:N/UI:N); impact is pure memory-exhaustion DoS, so C:N/I:N/A:H.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Jul 14, 2026 - 18:20 EUVD
Source Code Evidence Fetched
Jul 14, 2026 - 16:07 vuln.today
Analysis Generated
Jul 14, 2026 - 16:07 vuln.today
CVE Published
Jul 14, 2026 - 15:38 cve.org
HIGH 8.7

DescriptionCVE.org

Pillow is a Python imaging library. From 8.2.0 through 12.2.0, src/libImaging/Jpeg2KDecode.c accumulates total_component_width across every tile in a JPEG2000 image instead of recomputing it per tile, allowing a crafted tiled JPEG2000 file to force substantially higher transient memory usage and trigger out-of-memory failures during decoding. 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

Denial of service in Python Pillow (versions 8.2.0 through 12.2.0) allows remote attackers to exhaust memory during JPEG2000 decoding, causing out-of-memory failures in any application that decodes untrusted images. The flaw stems from Pillow's JPEG2000 decoder summing tile widths across the whole image rather than per tile, so a small crafted tiled file forces disproportionately large transient allocations. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft tiled JPEG2000 file
Delivery
Submit to image-processing endpoint
Exploit
Pillow accumulates tile widths
Execution
Trigger oversized memory allocation
Impact
Exhaust host memory (OOM crash)
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Vulnerability AssessmentAI

Exploitation The target application must accept and decode a JPEG2000 (.jp2/.j2k) image supplied by the attacker using an affected Pillow version (8.2.0-12.2.0), and the malicious file must be tiled so that per-tile widths accumulate - a single-tile image does not trigger the bug. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but narrow-impact availability issue rather than a code-execution threat. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker uploads a small, specially crafted tiled JPEG2000 file to a web service that automatically generates thumbnails or previews with Pillow. When Pillow decodes it, the accumulated tile-width miscalculation drives a massive transient allocation, exhausting memory and crashing the worker or host. …
Remediation Vendor-released patch: upgrade to Pillow 12.3.0 or later (https://github.com/python-pillow/Pillow/releases/tag/12.3.0); the fix is PR #9704 / commit 13ada41172142f2fd9f0906f615a00ea623a11ca. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and catalog all systems running Python Pillow versions 8.2.0 through 12.2.0, prioritizing internet-facing applications and services that accept image uploads or process images from external sources. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-59204 vulnerability details – vuln.today
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