CVE-2026-59205: CWE-787: Out-of-bounds Write in python-pillow Pillow
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's ImageCms.ImageCmsTransform.apply(im, imOut) API can trigger controlled native heap corruption when the caller supplies an output image whose mode does not match the transform's declared output mode. This issue is fixed in version 12.3.0.
AI Analysis
Technical Summary
CVE-2026-59205 is an out-of-bounds write vulnerability (CWE-787) in the python-pillow Pillow library. Specifically, the ImageCms.ImageCmsTransform.apply(im, imOut) API can trigger controlled native heap corruption if the caller supplies an output image whose mode differs from the transform's declared output mode. This mismatch leads to memory corruption. The vulnerability affects all versions prior to 12.3.0 and is resolved in version 12.3.0.
Potential Impact
The vulnerability allows an attacker to cause controlled native heap corruption, which can lead to denial of service or potentially other impacts depending on the context of use. The CVSS v3.1 score is 7.5 (high severity) with network attack vector, low attack complexity, no privileges or user interaction required, and impacts availability but not confidentiality or integrity.
Mitigation Recommendations
A fix is available in python-pillow Pillow version 12.3.0. Users should upgrade to version 12.3.0 or later to remediate this vulnerability. No additional vendor advisory content is provided, so patch status is based on the version information given.
CVE-2026-59205: CWE-787: Out-of-bounds Write in python-pillow Pillow
Description
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's ImageCms.ImageCmsTransform.apply(im, imOut) API can trigger controlled native heap corruption when the caller supplies an output image whose mode does not match the transform's declared output mode. This issue is fixed in version 12.3.0.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-59205 is an out-of-bounds write vulnerability (CWE-787) in the python-pillow Pillow library. Specifically, the ImageCms.ImageCmsTransform.apply(im, imOut) API can trigger controlled native heap corruption if the caller supplies an output image whose mode differs from the transform's declared output mode. This mismatch leads to memory corruption. The vulnerability affects all versions prior to 12.3.0 and is resolved in version 12.3.0.
Potential Impact
The vulnerability allows an attacker to cause controlled native heap corruption, which can lead to denial of service or potentially other impacts depending on the context of use. The CVSS v3.1 score is 7.5 (high severity) with network attack vector, low attack complexity, no privileges or user interaction required, and impacts availability but not confidentiality or integrity.
Mitigation Recommendations
A fix is available in python-pillow Pillow version 12.3.0. Users should upgrade to version 12.3.0 or later to remediate this vulnerability. No additional vendor advisory content is provided, so patch status is based on the version information given.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-02T21:05:02.924Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a56616e68715ace43d27033
Added to database: 07/14/2026, 16:18:54 UTC
Last enriched: 07/14/2026, 16:32:54 UTC
Last updated: 07/15/2026, 02:25:31 UTC
Views: 4
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