Memory corruption via TypedArray copyWithin length underflow
Published May 19, 2026 · Updated May 19, 2026
Heap-based buffer overflow in Samsung Escargot at commit 590345cc6258317c5da850d846ce6baaf2afc2d3 allows local users to corrupt process memory. The builtinTypedArrayCopyWithin path lets a buffer resize during argument coercion make a remaining length negative, then casts that value to size_t for the copy count. The attack requires user interaction to execute crafted JavaScript, and successful heap corruption can crash the engine or compromise its process.
Summary
What happened
Heap-based buffer overflow in Samsung Escargot at commit 590345cc6258317c5da850d846ce6baaf2afc2d3 allows local users to corrupt process memory. The builtinTypedArrayCopyWithin path lets a buffer resize during argument coercion make a remaining length negative, then casts that value to size_t for the copy count. The attack requires user interaction to execute crafted JavaScript, and successful heap corruption can crash the engine or compromise its process.
The record
- CVE
- CVE-2026-47311
- Published
- May 19, 2026
- Updated
- May 19, 2026
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Escargot
- Classifications
- CWE-122, CAPEC-100, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 19, 2026CVE publishedPublication date reported by the CVE source.
- May 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=590345cc6258317c5da850d846ce6baaf2afc2d3
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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