CVE-2026-112402

8.7High

Published 19 Oct 2026 · NVD status: Received · AI triage by gemini-3.8-flash

8.7High

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Impact: High impact on availability
Weakness: CWE-416

Impact

Remote unauthenticated attackers can crash your service and potentially corrupt memory by supplying inputs that trigger large Image.transform() operations under memory pressure.

Root cause

An error-handling path in ImagingScaleAffine double-frees output image storage if a secondary per-column lookup allocation fails.

Affected systems

Pillow prior to 13.0.0

CVSS v4.0 · 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

Fix & remediation

Upgrade Pillow to version 13.0.0 or later. If upgrading must wait, avoid exposing Image.transform() calls using Transform.EXTENT or Transform.AFFINE with NEAREST resampling on untrusted input.

shell

$ pip install --upgrade 'pillow>=13.0.0'

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Pillow is a Python imaging library. Prior to 13.0.0, Pillow can double free image memory when ImagingScaleAffine encounters a selective allocation failure. The affected fast path handles Transform.EXTENT or pure scale-and-translate Transform.AFFINE operations with the default NEAREST resampling. The output image allocation must succeed while the additional per-column lookup allocation fails, after which the error path deletes image storage that later cleanup releases again. An attacker who can drive such a large Image.transform() operation under memory pressure may trigger the failure. This can crash the process and may corrupt memory. This issue is fixed in version 13.0.0.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-112402