Pillow: Heap out-of-bounds write `Image.paste()` / `Image.crop()` via signed coordinate overflow

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Summary

CVECVE-2026-59199
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 16:17:01 UTC
Updated2026-07-14 20:18:04 UTC
DescriptionPillow is a Python imaging library. Prior to 12.3.0, Pillow public image coordinate APIs can trigger a native heap out-of-bounds write when given coordinates near the signed 32-bit integer limits in Image.paste(), Image.crop(), or Image.alpha_composite(). This issue is fixed in version 12.3.0.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-190 | CWE-787 | CWE-190 CWE-190: Integer Overflow or Wraparound | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Python Pillow All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python-pillow Pillow affected < 12.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/python-pillow/Pillow/commit/ceefc348eb3c3844c7f9796ef2cc3a7dd... [email protected] github.com Patch
github.com/python-pillow/Pillow/pull/9703 [email protected] github.com Exploit, Issue Tracking, Patch
github.com/python-pillow/Pillow/releases/tag/12.3.0 [email protected] github.com Release Notes
github.com/python-pillow/Pillow/security/advisories/GHSA-6r8x-57c9-28j4 [email protected] github.com Exploit, Vendor Advisory
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