Engine crash via unchecked intra-block jump
Published Jul 9, 2026 · Updated Jul 9, 2026
Heap overflow in Escargot before ef525f337fafddecde77a3c426212a84bb20cb98 allows local users to crash the engine with crafted JavaScript. InterpreterSlowPath::blockOperation propagates an intra-block NeedsJump destination, causing Interpreter::interpret to read eight bytes past the heap-backed bytecode buffer. Execution of attacker-supplied JavaScript is required; the public reproducer demonstrates an engine crash, while the CNA reports no confidentiality impact.
Summary
What happened
Heap overflow in Escargot before ef525f337fafddecde77a3c426212a84bb20cb98 allows local users to crash the engine with crafted JavaScript. InterpreterSlowPath::blockOperation propagates an intra-block NeedsJump destination, causing Interpreter::interpret to read eight bytes past the heap-backed bytecode buffer. Execution of attacker-supplied JavaScript is required; the public reproducer demonstrates an engine crash, while the CNA reports no confidentiality impact.
The record
- CVE
- CVE-2026-58306
- Published
- Jul 9, 2026
- Updated
- Jul 9, 2026
- Vendor
- Samsung Electronics Co., Ltd.
- Product
- Escargot
- Classifications
- CWE-122, CAPEC-100, T1499.004
- 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 <ef525f337fafddecde77a3c426212a84bb20cb98
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
- Escargot issue 1576 JavaScript reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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