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CVE-2026-42311

Pillow: OOB Write with Invalid PSD Tile Extents (Integer Overflow)

HIGH

7.8

CVSS Score

Published: May 9, 2026 at 04:11 AM UTC

Updated: July 24, 2026 at 09:20 PM UTC

2 products affected across 2 vendorsPillowPillow

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

Description

Pillow is a Python imaging library. From version 10.3.0 to before version 12.2.0, processing a malicious PSD file could lead to memory corruption, potentially resulting in a crash or arbitrary code execution. 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%

10.3.0 ≤ 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

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_CONFIRMPatchVendor Advisory

Source: cverecord

https://github.com/python-pillow/Pillow/security/advisories/GHSA-pwv6-vv43-88gr

x_refsource_MISCIssue TrackingPatch

Source: cverecord

https://github.com/python-pillow/Pillow/pull/9520

x_refsource_MISCPatch

Source: cverecord

https://github.com/python-pillow/Pillow/commit/58f9a1d166dcb0c274807d4423522d205b0c35ea

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/python-pillow/Pillow/releases/tag/12.2.0

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

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

CVSS

7.8HIGH[email protected]

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-190CWE-787

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