ImageMagick heap buffer over-read via -distribute-cache (pre-6.9.13-48/7.1.2-23)
CVE-2026-47166 Published on June 10, 2026
ImageMagick: Heap Buffer Over-Read in distributed pixel cache server
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 6.9.13-48 and 7.1.2-23, an attacker who can connect to a magick -distribute-cache service can cause a heap buffer over-read in the server process. This issue has been patched in versions 6.9.13-48 and 7.1.2-23.
Vulnerability Analysis
CVE-2026-47166 is exploitable with local system access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a high impact on availability.
Weakness Types
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. 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 read operation then produces undefined or unexpected results.
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-47166 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-47166
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Affected Versions
ImageMagick:- Version < 6.9.13-48 is affected.
- Version < 7.1.2-23 is affected.