CVE-2026-25970: ImageMagick Has Signed Integer Overflow in SIXEL Decoder, Leading to Memory Corruption

March 12, 2026

A signed integer overflow vulnerability in ImageMagick’s SIXEL decoder allows an attacker to trigger memory corruption and denial of service when processing a maliciously crafted SIXEL image file. The vulnerability occurs during buffer reallocation operations where pointer arithmetic using signed 32-bit integers overflows.

AddressSanitizer:DEADLYSIGNAL
=================================================================
==143838==ERROR: AddressSanitizer: UNKNOWN SIGNAL on unknown address 0x000000000000

References

Code Behaviors & Features

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