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CVE-2026-42310

Pillow: PDF Parsing Trailer Infinite Loop (DoS)

MEDIUM
5.5
CVSS Score
Published: May 9, 2026 at 04:10 AM UTC
Updated: July 24, 2026 at 09:20 PM UTC
2 products affected across 2 vendorsPillowPillow

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Pillow· Pythonpypi
95%
4.2.0 ≤ v < 12.2.0
Affected range stops below 12.2.0, so it looks safe — our inference, not a vendor statement
Pillow· Python Pillow
60%
v < 12.2.0
Affected range stops below 12.2.0, so it looks safe — our inference, not a vendor statement

References (4)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/python-pillow/Pillow/pull/9519
x_refsource_MISCPatch
Source: cverecord
https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/python-pillow/Pillow/releases/tag/12.2.0

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-835

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