CVE-2026-59199: pillow Integer Overflow

Description

Pillow 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.

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CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0039

Probability of exploitation

0.32%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-190 Integer Overflow

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
python	pillow	< 12.3.0

References

Advisories & Patches

https://github.com/python-pillow/Pillow/commit/ceefc348eb3c3844c7f9796ef2cc3a7dd5fbba7b https://github.com/python-pillow/Pillow/pull/9703 https://github.com/python-pillow/Pillow/security/advisories/GHSA-6r8x-57c9-28j4 https://github.com/python-pillow/Pillow/security/advisories/GHSA-6r8x-57c9-28j4

Exploits

https://github.com/python-pillow/Pillow/pull/9703 https://github.com/python-pillow/Pillow/security/advisories/GHSA-6r8x-57c9-28j4 https://github.com/python-pillow/Pillow/security/advisories/GHSA-6r8x-57c9-28j4

Other References

https://github.com/python-pillow/Pillow/releases/tag/12.3.0

Frequently Asked Questions

What is CVE-2026-59199? +

Pillow 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-59199? +

CVE-2026-59199 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0039, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-59199? +

CVE-2026-59199 affects products from python, specifically: pillow. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-59199? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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