CVE-2026-21281CWE-122CWE-787

CVE-2026-21281

High · published January 14, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
12.9
In the wild
Unconfirmed
What it is

⚡ A single malicious file is all it takes for this Heap-based Buffer Overflow to turn your InCopy into a gateway for chaos! 😱 Think of it like a friendly invitation to a party that, unbeknownst to you, comes with an uninvited guest — once you open that file, the unwanted guest can crash the whole party! 🎉 If exploited, an attacker could run arbitrary code in the current user's context, giving them the keys to your digital kingdom. This could lead to unauthorized access to your files, data manipulation, or even a complete system takeover. It's a high-stakes game that could have devastating consequences!

Put simply

Think of it like a friendly invitation to a party that, unbeknownst to you, comes with an uninvited guest — once you open that file, the unwanted guest can crash the whole party! 🎉 This vulnerability arises from a buffer overflow in InCopy versions 21.0, 19.5.5 and earlier, allowing attackers to execute arbitrary code if a user opens a specially crafted file. Essentially, the application tries to fit too much data into a space it can't handle, leading to unpredictable behavior.

What to do

If exploited, an attacker could run arbitrary code in the current user's context, giving them the keys to your digital kingdom. This could lead to unauthorized access to your files, data manipulation, or even a complete system takeover. It's a high-stakes game that could have devastating consequences! To protect yourself, update InCopy to version 21.1 or later immediately. Encourage users to avoid opening files from untrusted sources, and consider implementing file integrity checks to catch potentially harmful files before they're opened. 🛡️ You've got this! By following these steps, you can keep your InCopy safe and secure. 🌟

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00228 · 12.9th percentile
Weaknesses
CWE-122 · Heap-based Buffer Overflow; CWE-787 · Out-of-bounds Write
Published
2026-01-14T00:16Z
Affected products (2)
ProductVersionsFixed in
adobe/incopy< 20.5.120.5.1
adobe/incopyall versions—
References (1)
EPSS history
Timeline
  • 13 JAN 18:45Z
    InCopy | Heap-based Buffer Overflow (CWE-122)
    cvelistv5