Code execution via malicious file out-of-bounds write
Published Apr 14, 2026 · Updated Apr 14, 2026
Out-of-bounds write in Adobe InCopy 20.5.2 and 21.2 and earlier allows remote attackers to execute code through a malicious file. Adobe has not disclosed the affected file parser, memory structure, or missing bounds check behind the out-of-bounds write. The victim must open the file, after which code runs with the victim's current-user privileges on Windows or macOS.
Summary
What happened
Out-of-bounds write in Adobe InCopy 20.5.2 and 21.2 and earlier allows remote attackers to execute code through a malicious file. Adobe has not disclosed the affected file parser, memory structure, or missing bounds check behind the out-of-bounds write. The victim must open the file, after which code runs with the victim's current-user privileges on Windows or macOS.
The record
- CVE
- CVE-2026-34631
- Published
- Apr 14, 2026
- Updated
- Apr 14, 2026
- Vendor
- Adobe
- Product
- InCopy
- Classifications
- CWE-787, T1203, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 14, 2026CVE publishedPublication date reported by the CVE source.
- Apr 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=21.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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