ImageMagick <=7.1.2-18 OOB Heap Write via YAML/JSON
CVE-2026-40169 Published on April 13, 2026

ImageMagick: Heap buffer overflow (WRITE) in the YAML and JSON encoders
ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-19, a crafted image could result in an out of bounds heap write when writing a yaml or json output, resulting in a crash. This issue has been fixed in version 7.1.2-19.

NVD

Vulnerability Analysis

CVE-2026-40169 can be exploited with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Types

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2026-40169 has been classified to as a Memory Corruption vulnerability or weakness.


Products Associated with CVE-2026-40169

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ImageMagick
 

Affected Versions

ImageMagick Version < 7.1.2-19 is affected by CVE-2026-40169

Exploit Probability

EPSS
0.01%
Percentile
1.53%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.