Vulnerability Details CVE-2026-28231
pillow_heif is a Python library for working with HEIF images and plugin for Pillow. Prior to version 1.3.0, an integer overflow in the encode path buffer validation of `_pillow_heif.c` allows an attacker to bypass bounds checks by providing large image dimensions, resulting in a heap out-of-bounds read. This can lead to information disclosure (server heap memory leaking into encoded images) or denial of service (process crash). No special configuration is required — this triggers under default settings. Version 1.3.0 fixes the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 11.8%
CVSS Severity
CVSS v3 Score 9.1
References
Products affected by CVE-2026-28231
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cpe:2.3:a:bigcat88:pillow-heif:0.1.1
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cpe:2.3:a:bigcat88:pillow-heif:0.1.10
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cpe:2.3:a:bigcat88:pillow-heif:0.1.11
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cpe:2.3:a:bigcat88:pillow-heif:0.1.2
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cpe:2.3:a:bigcat88:pillow-heif:0.1.3
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cpe:2.3:a:bigcat88:pillow-heif:0.1.4
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cpe:2.3:a:bigcat88:pillow-heif:0.1.5
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cpe:2.3:a:bigcat88:pillow-heif:0.1.6
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cpe:2.3:a:bigcat88:pillow-heif:0.1.7
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cpe:2.3:a:bigcat88:pillow-heif:0.1.8
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cpe:2.3:a:bigcat88:pillow-heif:0.1.9
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cpe:2.3:a:bigcat88:pillow-heif:0.10.0
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cpe:2.3:a:bigcat88:pillow-heif:0.10.1
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cpe:2.3:a:bigcat88:pillow-heif:0.11.0
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cpe:2.3:a:bigcat88:pillow-heif:0.11.1
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cpe:2.3:a:bigcat88:pillow-heif:0.12.0
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cpe:2.3:a:bigcat88:pillow-heif:0.13.0
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cpe:2.3:a:bigcat88:pillow-heif:0.13.1
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cpe:2.3:a:bigcat88:pillow-heif:0.14.0
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cpe:2.3:a:bigcat88:pillow-heif:0.15.0
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cpe:2.3:a:bigcat88:pillow-heif:0.16.0
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cpe:2.3:a:bigcat88:pillow-heif:0.17.0
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cpe:2.3:a:bigcat88:pillow-heif:0.18.0
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cpe:2.3:a:bigcat88:pillow-heif:0.2.0
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cpe:2.3:a:bigcat88:pillow-heif:0.2.1
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cpe:2.3:a:bigcat88:pillow-heif:0.2.2
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cpe:2.3:a:bigcat88:pillow-heif:0.2.3
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cpe:2.3:a:bigcat88:pillow-heif:0.2.4
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cpe:2.3:a:bigcat88:pillow-heif:0.2.5
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cpe:2.3:a:bigcat88:pillow-heif:0.20.0
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cpe:2.3:a:bigcat88:pillow-heif:0.21.0
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cpe:2.3:a:bigcat88:pillow-heif:0.22.0
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cpe:2.3:a:bigcat88:pillow-heif:0.3.0
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cpe:2.3:a:bigcat88:pillow-heif:0.3.1
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cpe:2.3:a:bigcat88:pillow-heif:0.3.2
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cpe:2.3:a:bigcat88:pillow-heif:0.4.0
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cpe:2.3:a:bigcat88:pillow-heif:0.5.0
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cpe:2.3:a:bigcat88:pillow-heif:0.5.1
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cpe:2.3:a:bigcat88:pillow-heif:0.6.0
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cpe:2.3:a:bigcat88:pillow-heif:0.6.1
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cpe:2.3:a:bigcat88:pillow-heif:0.7.0
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cpe:2.3:a:bigcat88:pillow-heif:0.7.1
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cpe:2.3:a:bigcat88:pillow-heif:0.7.2
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cpe:2.3:a:bigcat88:pillow-heif:0.8.0
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cpe:2.3:a:bigcat88:pillow-heif:0.9.0
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cpe:2.3:a:bigcat88:pillow-heif:0.9.1
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cpe:2.3:a:bigcat88:pillow-heif:0.9.2
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cpe:2.3:a:bigcat88:pillow-heif:0.9.3
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cpe:2.3:a:bigcat88:pillow-heif:1.0.0
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cpe:2.3:a:bigcat88:pillow-heif:1.1.0
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cpe:2.3:a:bigcat88:pillow-heif:1.1.1
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cpe:2.3:a:bigcat88:pillow-heif:1.2.0
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cpe:2.3:a:bigcat88:pillow-heif:1.2.1