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Python Pillow CVE-2026-59203

| EUVDEUVD-2026-43741 HIGH
Loop with Unreachable Exit Condition (Infinite Loop) (CWE-835)
2026-07-14 GitHub_M GHSA-pg7v-jwj7-p798
Python Denial Of Service Pillow Red Hat Suse
7.5
CVSS 3.1 · NVD
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Severity by source

Vendor (GitHub_M) PRIMARY
MEDIUM
qualitative
NVD
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

Untrusted EPS reaches the parser over the network with no auth or interaction (AV:N/AC:L/PR:N/UI:N); impact is an availability-only hang, 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
SUSE
6.2 MEDIUM
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorNVD

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

Lifecycle Timeline

8
Analysis Updated
Jul 14, 2026 - 20:29 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 14, 2026 - 20:22 vuln.today
cvss_changed
Severity Changed
Jul 14, 2026 - 20:22 NVD
MEDIUM HIGH
CVSS changed
Jul 14, 2026 - 20:22 NVD
5.3 (MEDIUM) 7.5 (HIGH)
Patch available
Jul 14, 2026 - 18:20 EUVD
Source Code Evidence Fetched
Jul 14, 2026 - 16:31 vuln.today
Analysis Generated
Jul 14, 2026 - 16:31 vuln.today
CVE Published
Jul 14, 2026 - 15:43 cve.org
MEDIUM 5.3

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 135 pypi packages depend on pillow (109 direct, 26 indirect)

Ecosystem-wide dependent count for version 12.0.0.

DescriptionNVD

Pillow is a Python imaging library. From 12.0.0 through 12.2.0, Pillow's EPS parser in PIL/EpsImagePlugin.py accepts a negative byte count in the %%BeginBinary directive, allowing a crafted EPS file to cause Image.open() to seek backwards to the same directive and parse it repeatedly in an infinite loop. 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 12.0.0 through 12.2.0 lets a remote attacker hang an application by supplying a crafted EPS image whose %%BeginBinary directive declares a negative byte count, causing the EPS parser to seek backwards and re-parse the same directive forever. Any service that calls Image.open() on attacker-supplied EPS data is affected until upgraded to 12.3.0. No public exploit identified at time of analysis, though the upstream fix PR includes a test reproducer; the flaw is not listed in CISA KEV.

Technical ContextAI

Pillow is the de facto Python imaging library (fork of PIL) used for decoding and processing images across web backends, thumbnailing pipelines, and data-science tooling. The defect lives in PIL/EpsImagePlugin.py, which parses Encapsulated PostScript (EPS) DSC comments. When it encounters a %%BeginBinary directive it reads a declared byte count and uses it to advance through the binary section; because the value was never validated as non-negative, a negative count causes the file pointer to seek backwards to the same directive, which is then parsed again indefinitely. This maps to CWE-835 (Loop with Unreachable Exit Condition, i.e. an infinite loop). The affected CPE is cpe:2.3:a:python-pillow:pillow, and the fix (commit 03992618, PR #9708) adds an explicit check that raises ValueError 'BeginBinary bytecount cannot be negative'.

RemediationAI

Vendor-released patch: upgrade to Pillow 12.3.0 (pip install --upgrade 'Pillow>=12.3.0'), which adds validation rejecting a negative %%BeginBinary bytecount; see GHSA-pg7v-jwj7-p798 and the 12.3.0 release notes at https://github.com/python-pillow/Pillow/releases/tag/12.3.0. Where an immediate upgrade is not possible, the most effective compensating control is to stop parsing untrusted EPS: reject EPS uploads at the application layer or restrict Image.open() to an explicit allowlist of expected formats (e.g. pass formats=['PNG','JPEG'] so EPS is never dispatched to the vulnerable plugin), which removes the attack surface at the cost of losing EPS support. If EPS must be processed, run the parsing in a sandboxed worker with a hard wall-clock timeout and per-request CPU limits so an infinite loop kills only that isolated job rather than the main service; the trade-off is added operational complexity and latency.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Python 3 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Not-Affected

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CVE-2026-59203 vulnerability details – vuln.today
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