ImageMagick Magick XML OOB Zero-Byte Write (6.9.13-44,7.1.2-189)
CVE-2026-33899 Published on April 13, 2026
ImageMagick: Heap BufferOverflow write of single zero byte when parsing XML
ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-189 and 6.9.13-44, when `Magick` parses an XML file it is possible that a single zero byte is written out of the bounds. This issue has been fixed in versions 6.9.13-44 and 7.1.2-19.
Vulnerability Analysis
CVE-2026-33899 can be exploited with network 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 small impact on availability.
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 an Integer underflow Vulnerability?
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.
CVE-2026-33899 has been classified to as an Integer underflow vulnerability or weakness.
Products Associated with CVE-2026-33899
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Affected Versions
ImageMagick:- Version < 6.9.13-44 is affected.
- Version < 7.1.2-19 is affected.
Exploit Probability
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.