CVE-2026-47310 Overview
CVE-2026-47310 is a use-after-free vulnerability [CWE-416] in Samsung Open Source Escargot, a lightweight JavaScript engine designed for resource-constrained environments. The flaw allows pointer manipulation when the engine references memory that has already been freed. The issue affects Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3.
Exploitation requires local access and user interaction. Successful exploitation can lead to memory corruption with high impact on confidentiality, integrity, and availability of the affected process.
Critical Impact
Attackers with local access can manipulate freed memory pointers through crafted JavaScript, leading to arbitrary code execution within the context of the Escargot runtime.
Affected Products
- Samsung Open Source Escargot JavaScript engine
- Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3
- Applications and devices embedding the affected Escargot build
Discovery Timeline
- 2026-05-19 - CVE-2026-47310 published to NVD
- 2026-05-19 - Last updated in NVD database
Technical Details for CVE-2026-47310
Vulnerability Analysis
The vulnerability is a use-after-free condition in the Escargot JavaScript engine. Escargot is a lightweight engine built by Samsung for embedded and IoT scenarios where memory footprint matters. The engine manages JavaScript objects through internal pointer references and a garbage-collected heap.
In this case, the engine retains a pointer to a memory region after the underlying object has been freed. When attacker-controlled JavaScript reaches a code path that dereferences the stale pointer, the engine operates on memory that may now contain different data or another object. This pointer manipulation primitive can be chained into arbitrary read, arbitrary write, or control-flow hijacking.
The attack vector is local and requires user interaction, consistent with scenarios where a victim loads a malicious script in an application that embeds Escargot. Impact on confidentiality, integrity, and availability is high because successful exploitation typically yields code execution in the host process.
Root Cause
The root cause is improper lifetime management of an internal object reference. The engine frees the backing memory while another code path still holds a usable pointer to it. The fix, available in the upstream pull request, adjusts ownership and reference handling so the pointer cannot be reused after release.
Attack Vector
An attacker delivers a crafted JavaScript payload to an application that embeds the vulnerable Escargot build. The user must execute the script, for example by opening a file, visiting a local resource, or launching an embedded application. The script triggers the freeing operation and then forces the engine to use the dangling pointer, achieving memory corruption.
No verified public proof-of-concept code is available. Technical details and the corresponding fix are described in the Escargot pull request 1565.
Detection Methods for CVE-2026-47310
Indicators of Compromise
- Unexpected crashes of processes embedding the Escargot engine, particularly with SIGSEGV or heap corruption signatures
- JavaScript files that trigger rapid allocation and release of objects followed by reuse of references
- Anomalous child processes spawned by applications that host the Escargot runtime
Detection Strategies
- Inventory all software and firmware images that include Escargot and confirm the commit hash against 590345cc6258317c5da850d846ce6baaf2afc2d3
- Enable application crash telemetry and correlate faults occurring during JavaScript execution
- Apply runtime memory protections such as AddressSanitizer in development builds to surface use-after-free conditions during testing
Monitoring Recommendations
- Collect process crash dumps from endpoints and embedded devices that run Escargot-based applications
- Monitor file system writes and outbound connections initiated by processes that host the JavaScript engine
- Track the introduction of unsigned or unexpected JavaScript files in directories consumed by the application
How to Mitigate CVE-2026-47310
Immediate Actions Required
- Identify all builds linking against Escargot at or before commit 590345cc6258317c5da850d846ce6baaf2afc2d3 and prioritize them for update
- Rebuild affected products against a patched Escargot revision that incorporates the upstream fix from pull request 1565
- Restrict execution of untrusted JavaScript in applications that embed Escargot until patched builds are deployed
Patch Information
The fix is provided upstream in the Samsung Escargot repository. Review and integrate the changes from the Escargot pull request 1565, then rebuild and redistribute any downstream products that statically link the engine. Verify the resulting binary references a commit later than 590345cc6258317c5da850d846ce6baaf2afc2d3.
Workarounds
- Disable or sandbox JavaScript execution paths in affected applications where feasible
- Restrict the source of JavaScript content to signed or trusted origins only
- Apply operating system level mitigations such as ASLR and DEP to raise the cost of exploitation while a patched build is prepared
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
