Samsung Escargot Stack Buffer Overflow Vulnerability
Stack-based buffer overflow vulnerability in Samsung Open Source Escargot allows Overflow Buffers. This issue affects Escargot: before b30b63fc63b403907d8137da1c65aaa4521fe74e.
Quick answer
Samsung Open Source Escargot should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Escargot before b30b63fc63b403907d8137da1c65aaa4521fe74e
Fixed versions
- b30b63fc63b403907d8137da1c65aaa4521fe74e
How to fix it
Samsung Escargot is affected by CVE-2026-58303. Vulnerable builds before commit b30b63fc63b403907d8137da1c65aaa4521fe74e contain a memory safety issue: a stack buffer overflow can be triggered in vulnerable Escargot builds. Any product embedding Escargot should update the engine source, rebuild, and ship the patched binary.
- Identify every product, firmware image, service, or test harness embedding Samsung Escargot.
- Update Escargot source to include commit b30b63fc63b403907d8137da1c65aaa4521fe74e or a later trusted upstream revision.
- Rebuild dependent applications and packages from the patched source tree.
- Redeploy patched binaries to production, staging, and distribution artifacts.
- Restrict untrusted JavaScript execution paths until the patched engine is deployed.
- Review crash telemetry, sanitizer reports, and input logs for signs of memory safety failures.
- Retire old build artifacts so vulnerable binaries are not reintroduced by rollback or cache.
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Verify the fix
- Confirm the deployed Escargot build includes commit b30b63fc63b403907d8137da1c65aaa4521fe74e or later.
- Run the project's JavaScript engine regression tests after rebuilding.
- Use sanitizer or fuzz smoke tests against the affected parser/runtime path where available.
- Confirm deployed binaries have changed version/hash from the vulnerable build.
- Run a Fixnx scan and verify any public interface using the embedded engine has been reviewed.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-58303?
Samsung Open Source Escargot versions listed as affected should be reviewed: Escargot before b30b63fc63b403907d8137da1c65aaa4521fe74e.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.