CVE-2026-47315: Samsung Escargot Input Data Vulnerability

CVE-2026-47315 Overview

CVE-2026-47315 is a medium-severity vulnerability in Samsung Open Source Escargot, a lightweight JavaScript engine designed for resource-constrained environments. The flaw stems from an improper check for unusual or exceptional conditions [CWE-754], which allows input data manipulation that can lead to a high-impact availability failure. The vulnerability affects Escargot at commit 590345cc6258317c5da850d846ce6baaf2afc2d3. An attacker with local access can trigger the condition by supplying crafted input that the engine fails to validate, resulting in a denial-of-service state.

Critical Impact

Local attackers can manipulate input data to cause complete loss of availability in applications embedding the Escargot JavaScript engine.

Affected Products

• Samsung Open Source Escargot JavaScript engine
• Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3
• Applications and embedded systems integrating the affected Escargot build

Discovery Timeline

• 2026-05-19 - CVE CVE-2026-47315 published to NVD
• 2026-05-19 - Last updated in NVD database

Technical Details for CVE-2026-47315

Vulnerability Analysis

The vulnerability resides in Samsung's Escargot JavaScript engine, which targets embedded and IoT workloads where memory and CPU footprint are constrained. The engine fails to properly check for unusual or exceptional conditions when processing certain input. When the unexpected state occurs, Escargot does not handle the exception path safely and instead enters a state that terminates execution or hangs the host process. The attack requires local access and user interaction, which limits remote exploitation. However, on devices that automatically execute scripts or process untrusted JavaScript content, the user-interaction requirement can be satisfied through normal application workflows.

Root Cause

The root cause is classified under [CWE-754]: Improper Check for Unusual or Exceptional Conditions. The engine code path assumes that certain runtime conditions hold true without verifying them. When attacker-controlled input violates these assumptions, the missing validation allows the exceptional state to propagate, producing an unrecoverable error rather than a controlled exception. The upstream fix is tracked in the Samsung Escargot pull request #1565.

Attack Vector

Exploitation requires local access and user interaction. An attacker crafts malicious JavaScript input that triggers the unchecked condition during parsing or execution. The confidentiality and integrity of data remain unaffected, but availability is fully compromised. In embedded and IoT deployments where Escargot powers UI logic or device automation, a successful trigger can crash the controlling application and disrupt device functionality. No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

No verified exploit code is publicly available. Refer to the Samsung Escargot pull request #1565 for the technical fix details.

Detection Methods for CVE-2026-47315

Indicators of Compromise

• Unexpected crashes or hangs in applications or firmware that embed the Escargot JavaScript engine
• Repeated abnormal termination of processes hosting Escargot when handling untrusted scripts
• Anomalous JavaScript files delivered to devices or applications that integrate Escargot

Detection Strategies

• Inventory all software and firmware images that bundle Escargot and compare embedded versions against commit 590345cc6258317c5da850d846ce6baaf2afc2d3
• Monitor process exit codes and core dumps from applications hosting the Escargot runtime for repeated availability failures
• Inspect input pipelines that feed JavaScript content to Escargot for unusual constructs that target exception-handling paths

Monitoring Recommendations

• Log all script loads handled by Escargot, including source path and originating user context, to support post-incident analysis
• Alert on repeated crash signatures originating from the same script source within a short interval
• Track file integrity for JavaScript assets shipped with embedded products to identify unauthorized modifications

How to Mitigate CVE-2026-47315

Immediate Actions Required

• Identify all builds and devices using Escargot at commit 590345cc6258317c5da850d846ce6baaf2afc2d3 and prioritize them for remediation
• Restrict local user accounts from supplying untrusted JavaScript input to applications embedding Escargot
• Rebuild affected products against a patched Escargot revision that incorporates the fix from pull request #1565

Patch Information

The upstream remediation is available in the Samsung Escargot pull request #1565. Vendors and integrators shipping Escargot should pull the merged commit, rebuild affected firmware or application binaries, and distribute the updated builds to deployed devices. No vendor advisory beyond the GitHub pull request is currently published.

Workarounds

• Disable or sandbox JavaScript execution paths in affected applications until the patched Escargot build is deployed
• Apply input validation at the application layer to reject malformed scripts before they reach the Escargot engine
• Reduce local attack surface by enforcing least-privilege access controls on systems that run vulnerable Escargot builds

# Verify the Escargot revision shipped in a build
git -C /path/to/escargot rev-parse HEAD
# Replace the vulnerable revision with the patched build
git -C /path/to/escargot fetch origin pull/1565/head:fix-cve-2026-47315
git -C /path/to/escargot checkout fix-cve-2026-47315