CVE-2026-112899: pillow DoS — Exploit & Fix

Description

Pillow is a Python imaging library. In versions 2.3.0 through 12.3.0, EPS rendering does not validate the scaled image dimensions before invoking Ghostscript. Applications that process untrusted EPS or PostScript files using an application-selected scale greater than one can incur excessive Ghostscript CPU and temporary disk consumption. In versions with decompression-bomb protection, the scaled output is checked only after Ghostscript has completed rendering, allowing resource consumption beyond the configured pixel limit. The amplification depends on the scale selected by the application, not an attacker-controlled scale value. This issue is fixed in version 13.0.0.

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CVSS v3.1 Score

5.3

MEDIUM

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

EPSS — Exploit Prediction

0.0055

Probability of exploitation

0.46%

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-770 CWE-770

Affected Products

Vendor	Product	Versions
python	pillow	2.3.0 — 13.0.0

References

Advisories & Patches

https://github.com/python-pillow/Pillow/commit/3e8cc105588d1dfe062fcada0b6058c1b5f14b65 https://github.com/python-pillow/Pillow/pull/10112 https://github.com/python-pillow/Pillow/security/advisories/GHSA-vx6w-vv9f-6gvg https://github.com/python-pillow/Pillow/security/advisories/GHSA-vx6w-vv9f-6gvg

Exploits

https://github.com/python-pillow/Pillow/security/advisories/GHSA-vx6w-vv9f-6gvg https://github.com/python-pillow/Pillow/security/advisories/GHSA-vx6w-vv9f-6gvg

Other References

https://github.com/python-pillow/Pillow/releases/tag/13.0.0

Frequently Asked Questions

What is CVE-2026-112899? +

Pillow is a Python imaging library. In versions 2.3.0 through 12.3.0, EPS rendering does not validate the scaled image dimensions before invoking Ghostscript. Applications that process untrusted EPS or PostScript files using an application-selected scale greater than one can incur excessive Ghostscript CPU and temporary disk consumption. In versions with decompression-bomb protection, the scaled output is checked only after Ghostscript has completed rendering, allowing resource consumption beyond the configured pixel limit. The amplification depends on the scale selected by the application, not an attacker-controlled scale value. This issue is fixed in version 13.0.0. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-112899? +

CVE-2026-112899 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0055, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-112899? +

CVE-2026-112899 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-2026-112899? +

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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