CVE-2026-49509 in Escargot
Summary
by MITRE • 09/04/2026
Out-of-bounds read vulnerability in Samsung Opensource Escargot allows Overread Buffers.
This issue affects Escargot: 25648aef19187b3f87f4d9420b8d761453ad4630.
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Analysis
by VulDB Data Team • 09/04/2026
The identified vulnerability resides within the Samsung Opensource Escargot JavaScript engine, specifically affecting commit 25648aef19187b3f87f4d9420b8d761453ad4630. This component serves as a core runtime for executing JavaScript code in various Samsung devices and embedded systems that rely on this open-source engine. The flaw is classified as an out-of-bounds read, which falls under the Common Weakness Enumeration category CWE-125: Out-of-bounds Read. This type of vulnerability occurs when software reads data from a memory location beyond the intended boundary of a buffer or array structure. In the context of Escargot, this typically manifests during the parsing or execution phase where the engine attempts to access elements within an internal data structure without adequately verifying that the index is valid relative to the current size of the container.
From a technical perspective, the vulnerability likely stems from insufficient validation checks on indices used for array or string operations within the JIT compiler or interpreter components of Escargot. When a maliciously crafted JavaScript payload triggers specific execution paths, it can cause the engine to calculate an index that exceeds the allocated memory space. Instead of throwing a standard range error and halting execution, the engine proceeds to read from adjacent memory regions. This behavior allows for the leakage of sensitive information stored in nearby heap or stack allocations. The attacker does not need direct access to the device; rather, they can exploit this flaw through any application that renders web content using Escargot as its underlying JavaScript runtime.
The operational impact of this vulnerability is significant due to its potential for information disclosure and further exploitation chains. An out-of-bounds read enables an adversary to exfiltrate internal state data from the browser or application sandbox, which may include cryptographic keys, session tokens, user credentials, or other private data residing in adjacent memory blocks. Furthermore, such vulnerabilities are frequently leveraged as part of a larger exploit strategy. By carefully crafting inputs that trigger this overread condition, an attacker can achieve arbitrary read primitives, which serve as critical building blocks for more severe attacks like arbitrary code execution. This aligns with the MITRE ATT&CK technique T1082: System Information Discovery, where adversaries gather information about the target system to facilitate subsequent lateral movement or privilege escalation.
Mitigation strategies must focus on both immediate patching and long-term defensive coding practices. The primary remediation is for Samsung and downstream vendors to integrate a patched version of Escargot that includes rigorous bounds checking before any memory access operation involving dynamic indices. Developers should enforce strict validation logic in the parser and interpreter modules to ensure that all array accesses, string manipulations, and buffer operations are confined within allocated limits. Additionally, implementing compiler-level protections such as Address Sanitizer during development can help detect these issues early in the lifecycle. For end-users, ensuring that device firmware is updated to include the latest security patches for Escargot is essential to close this attack vector. Security teams should also monitor for indicators of compromise related to unusual memory access patterns or JavaScript engine crashes within affected applications.