SB2026041113 - Multiple vulnerabilities in Pillow

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Main Vulnerability Database SB2026041113

SB2026041113 - Multiple vulnerabilities in Pillow

Published: April 11, 2026 Updated: July 7, 2026

Security Bulletin ID SB2026041113
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 6
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

High 17% Medium 83%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 6 vulnerabilities.


1) Resource exhaustion (CVE-ID: CVE-2026-40192)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the FITS image decoder when parsing a specially crafted GZIP-compressed FITS file. A remote attacker can supply a specially crafted FITS file to cause a denial of service.

The issue can result in unbounded memory consumption, leading to an out-of-memory crash or severe performance degradation.


2) Heap-based buffer overflow (CVE-ID: CVE-2026-42309)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 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:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a heap-based buffer overflow in coordinate-processing APIs such as ImagePath.Path, ImageDraw.ImageDraw.polygon, and ImageDraw.ImageDraw.line when processing nested list coordinates. A remote attacker can pass nested lists as coordinates to cause a denial of service.

The issue was introduced in Pillow 11.2.1.


3) Integer overflow (CVE-ID: CVE-2026-42308)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to integer overflow in font processing when handling fonts with excessively large glyph advance values. A remote attacker can supply a specially crafted font to cause a denial of service.


4) Infinite loop (CVE-ID: CVE-2026-42310)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an infinite loop in PdfParser when parsing a malicious PDF trailer with cyclic Prev pointers. A remote attacker can supply a specially crafted PDF file to cause a denial of service.

The issue can cause the process to hang indefinitely, consume 100% CPU, and make the application unresponsive.


5) Out-of-bounds read (CVE-ID: CVE-2026-59198)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the TGA RLE encoder when saving a mode "1" image through the public save API with TGA RLE compression. A remote attacker can save a specially crafted image to disclose sensitive information.

The issue can serialize adjacent process heap bytes into the generated TGA file, and a maximum-width single-row image can expose nearly the full adjacent heap window.


6) Heap-based buffer overflow (CVE-ID: CVE-2026-59197)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to cause a denial of service and overwrite heap memory.

The vulnerability exists due to a heap-based buffer overflow in the ImageFilter.RankFilter API and ImagingExpand function when processing a very large odd filter size through public rank-filter classes. A remote attacker can supply a specially crafted filter size to cause a denial of service and overwrite heap memory.

The issue is reachable through documented public classes including RankFilter, MedianFilter, MinFilter, and MaxFilter. If the image is also attacker-supplied, the out-of-bounds value written past the allocation can be influenced by source image border pixels.


Remediation

Install update from vendor's website.

References