Adobe InDesign Desktop 21.1/20.5.1 Heap Overflow - Arbitrary Code via File
CVE-2026-21357 Published on February 10, 2026
InDesign Desktop | Heap-based Buffer Overflow (CWE-122)
InDesign Desktop versions 21.1, 20.5.1 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Vulnerability Analysis
CVE-2026-21357 can be exploited with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
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().
Products Associated with CVE-2026-21357
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Affected Versions
Adobe InDesign Desktop:- Before and including 20.5.1 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.