Code execution via graphics heap overflow
Published Aug 11, 2026 · Updated Aug 25, 2026
Heap-based buffer overflow in Microsoft Office before the August 2026 fixes allows attackers to execute code locally via crafted Office content. Microsoft has disclosed only that the Office Graphics Component overruns a heap buffer while processing attacker-supplied content; the specific parser and faulty operation are not public. User interaction is required to reach the vulnerable path, and published records do not describe a privilege boundary bypass beyond local code execution.
Summary
What happened
Heap-based buffer overflow in Microsoft Office before the August 2026 fixes allows attackers to execute code locally via crafted Office content. Microsoft has disclosed only that the Office Graphics Component overruns a heap buffer while processing attacker-supplied content; the specific parser and faulty operation are not public. User interaction is required to reach the vulnerable path, and published records do not describe a privilege boundary bypass beyond local code execution.
The record
- CVE
- CVE-2026-63519
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-122, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
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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