CVE-2026-47316: Samsung Escargot Input Manipulation Flaw

CVE-2026-47316 Overview

CVE-2026-47316 is an Improper Check or Handling of Exceptional Conditions vulnerability [CWE-703] in Samsung Open Source Escargot, a lightweight JavaScript engine. The flaw affects Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3 and allows input data manipulation that leads to a high-impact availability failure. Exploitation requires local access and user interaction, but no privileges are needed. An attacker who supplies a crafted JavaScript input can trigger an unhandled exceptional condition, causing the engine to crash or terminate abnormally. The vulnerability does not expose data confidentiality or integrity.

Critical Impact
Local attackers can craft malicious JavaScript input that triggers improper exception handling in the Escargot engine, resulting in denial of service on the host process.

Affected Products

Samsung Open Source Escargot JavaScript Engine
Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3
Applications embedding the affected Escargot build

Discovery Timeline

2026-05-19 - CVE-2026-47316 published to the National Vulnerability Database (NVD)
2026-05-19 - Last updated in NVD database

Technical Details for CVE-2026-47316

Vulnerability Analysis

The vulnerability is classified under [CWE-703] Improper Check or Handling of Exceptional Conditions. Escargot fails to correctly validate or recover from an exceptional runtime state during JavaScript execution. When a specially crafted input reaches the affected code path, the engine does not handle the exception, causing process termination or abnormal behavior. The vulnerability requires the attacker to operate locally and depends on user interaction, such as opening a file or running a script. Successful exploitation results in loss of availability for the host process, but the issue does not yield code execution or information disclosure based on the published CVSS impact metrics.

Root Cause

The root cause is missing or insufficient exception handling logic within the Escargot interpreter. Specific runtime conditions are not validated against expected states, allowing an unchecked path to propagate. The corrective change is tracked in the upstream repository through GitHub Pull Request 1565 for Escargot, which introduces additional checks for the exceptional condition.

Attack Vector

Exploitation requires local delivery of malicious JavaScript content to an application that embeds the vulnerable Escargot build. The attacker must induce a user to load or execute the crafted input. Once parsed, the input drives the interpreter into the unhandled exceptional state, terminating execution. Network-based remote exploitation is not in scope for this issue. Refer to the upstream Escargot pull request for the technical fix details.

Detection Methods for CVE-2026-47316

Indicators of Compromise

Unexpected termination or crash logs from processes embedding the Escargot JavaScript engine
Presence of untrusted .js files delivered through email, removable media, or local file shares
Repeated abnormal exits of host applications shortly after loading user-supplied scripts

Detection Strategies

Monitor application crash telemetry and core dumps for stack frames originating in Escargot interpreter code
Inspect software inventories for builds compiled against Escargot commit 590345cc6258317c5da850d846ce6baaf2afc2d3
Correlate user-initiated script execution events with subsequent process termination within short time windows

Monitoring Recommendations

Enable host-level process monitoring to capture abnormal exits and unhandled exception events
Track file write and execution events for JavaScript artifacts in user-writable directories
Aggregate crash reports centrally to identify clusters tied to the same input source

How to Mitigate CVE-2026-47316

Immediate Actions Required

Identify all internal applications and devices that embed Samsung Escargot and inventory their commit versions
Restrict execution of untrusted JavaScript files on systems hosting vulnerable Escargot builds
Apply the upstream fix from Escargot pull request 1565 and rebuild dependent applications

Patch Information

The upstream remediation is published in the Samsung Escargot repository as GitHub Pull Request 1565. Vendors that ship Escargot as an embedded engine should integrate the fix and re-release affected products. Until rebuilt binaries are deployed, treat all hosts running the affected commit as vulnerable.

Workarounds

Block delivery of untrusted JavaScript content to applications that embed Escargot until patched builds are deployed
Run host applications under least-privilege accounts to limit the impact of process termination
Configure application sandboxes to automatically restart failed processes and preserve service availability

bash

# Verify the Escargot commit currently in use within a source tree
cd /path/to/escargot
git rev-parse HEAD
# If output matches 590345cc6258317c5da850d846ce6baaf2afc2d3, apply the upstream fix:
git fetch origin pull/1565/head:fix-cve-2026-47316
git checkout fix-cve-2026-47316