CVE-2026-47314 Overview
CVE-2026-47314 is an out-of-bounds write vulnerability in Samsung Open Source Escargot, a lightweight JavaScript engine designed for resource-constrained environments. The flaw allows attackers to overflow buffers and corrupt adjacent memory regions. The issue affects Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3. Exploitation requires local access and user interaction, but successful attacks can compromise confidentiality, integrity, and availability. The weakness is classified under CWE-787, Out-of-bounds Write.
Critical Impact
An attacker who convinces a user to process malicious JavaScript through the affected Escargot build can trigger memory corruption leading to arbitrary code execution within the engine's process context.
Affected Products
- Samsung Open Source Escargot JavaScript engine
- Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3
- Embedded applications and IoT devices that bundle the affected Escargot build
Discovery Timeline
- 2026-05-19 - CVE-2026-47314 published to NVD
- 2026-05-19 - Last updated in NVD database
Technical Details for CVE-2026-47314
Vulnerability Analysis
The vulnerability stems from an out-of-bounds write condition inside the Escargot JavaScript engine. The engine writes data past the end of an allocated buffer when processing specific input, corrupting adjacent memory. Out-of-bounds writes in JavaScript engines frequently translate into arbitrary code execution because attackers can shape heap layouts to overwrite function pointers, virtual tables, or JIT-emitted code regions.
Escargot is widely deployed in embedded products and IoT devices where it serves as the scripting runtime. Memory corruption inside the engine therefore affects any application that loads attacker-influenced scripts through the affected build. The vulnerability requires local attack vector and user interaction, which constrains remote drive-by exploitation but does not prevent exploitation through crafted content opened by a user.
Root Cause
The root cause is a missing or incorrect bounds check during a write operation in the engine. When the engine handles a particular code path, it computes a destination offset that exceeds the buffer's allocated size and writes attacker-controlled bytes outside the intended region. The exact code path is documented in the Samsung upstream pull request referenced below.
Attack Vector
An attacker crafts JavaScript or script input that, when parsed or executed by the vulnerable Escargot build, triggers the out-of-bounds write. The user must execute the malicious content through an application built on the affected engine. Successful exploitation corrupts heap metadata or adjacent objects, enabling memory disclosure, privilege escalation within the process, or arbitrary code execution.
No synthetic proof-of-concept code is reproduced here. Refer to the upstream patch for the precise code path and fix logic: Samsung Escargot Pull Request #1565.
Detection Methods for CVE-2026-47314
Indicators of Compromise
- Unexpected crashes or segmentation faults in processes that embed the Escargot JavaScript engine
- Core dumps showing corrupted heap metadata or invalid write addresses inside Escargot symbols
- Anomalous child processes spawned from applications that host the Escargot runtime
- Outbound network connections initiated by embedded devices immediately after script execution
Detection Strategies
- Inventory applications and firmware images that link against Escargot and check for commit 590345cc6258317c5da850d846ce6baaf2afc2d3 or earlier
- Enable AddressSanitizer (ASan) builds in development and QA pipelines to catch out-of-bounds writes at runtime
- Monitor endpoints and embedded devices for repeated crashes of the Escargot host process, which often precede successful exploitation
Monitoring Recommendations
- Collect crash telemetry from devices running Escargot-based applications and correlate against the vulnerable commit
- Log script source origins so analysts can identify which content triggered crashes
- Alert on post-crash behavior such as unexpected process restarts, new persistence mechanisms, or unusual network egress
How to Mitigate CVE-2026-47314
Immediate Actions Required
- Identify all internal applications, firmware, and IoT deployments that bundle Samsung Open Source Escargot
- Rebuild and redistribute affected products using a fixed Escargot commit that includes the patch from pull request #1565
- Restrict execution of untrusted JavaScript content in Escargot-based applications until patched builds are deployed
Patch Information
The upstream fix is provided through Samsung's GitHub repository in Escargot Pull Request #1565. Downstream maintainers must integrate the patched commit, rebuild affected binaries, and ship updates to all deployed devices and applications. Vendors that embed Escargot should publish their own advisories referencing CVE-2026-47314.
Workarounds
- Disable or sandbox the script execution feature in applications that embed Escargot where the feature is not essential
- Block delivery of untrusted script content through application-layer filtering on networks hosting affected devices
- Apply process-level mitigations such as seccomp filters or reduced privileges to limit the impact of memory corruption
# Verify the Escargot commit shipped in a build
cd /path/to/escargot
git log -1 --format="%H"
# If the commit equals 590345cc6258317c5da850d846ce6baaf2afc2d3 or predates PR #1565, rebuild from a patched revision:
git fetch origin
git checkout main
git pull
# Rebuild and redeploy the host application
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
