Memory corruption via incorrect ArrayBuffer transfer allocation
Published Jul 9, 2026 · Updated Jul 9, 2026
Out-of-bounds access in Escargot before 779f6bedf58f334dec64b0a51ebb724b4708b84a allows local users to corrupt memory via crafted JavaScript. The ArrayBuffer.prototype.transfer implementation fails to preserve the source buffer's resizable state when allocating the destination, allowing a typed-array view to access memory outside its backing store. Exploitation requires user interaction in an affected embedding context and can alter adjacent memory or terminate the process.
Summary
What happened
Out-of-bounds access in Escargot before 779f6bedf58f334dec64b0a51ebb724b4708b84a allows local users to corrupt memory via crafted JavaScript. The ArrayBuffer.prototype.transfer implementation fails to preserve the source buffer's resizable state when allocating the destination, allowing a typed-array view to access memory outside its backing store. Exploitation requires user interaction in an affected embedding context and can alter adjacent memory or terminate the process.
The record
- CVE
- CVE-2026-58304
- Published
- Jul 9, 2026
- Updated
- Jul 9, 2026
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Escargot
- Classifications
- CWE-787, CWE-125
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 9, 2026CVE publishedPublication date reported by the CVE source.
- Jul 9, 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?
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- Affected versionversion=0 <779f6bedf58f334dec64b0a51ebb724b4708b84a
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.
Public exploit references
- ArrayBuffer.prototype.transfer out-of-bounds reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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