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CVE-2026-47307 Samsung Open Source CVE debrief

A NULL pointer dereference vulnerability exists in Samsung Open Source Walrus, a WebAssembly runtime. The flaw can be triggered by a crafted WebAssembly module containing deeply nested instructions, resulting in denial of service. The vulnerability affects Walrus commit f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9. A fix has been proposed via pull request.

Vendor
Samsung Open Source
Product
Walrus
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-19
Original CVE updated
2026-07-24
Advisory published
2026-05-19
Advisory updated
2026-07-24

Who should care

Organizations operating WebAssembly execution services using Samsung Walrus, developers building applications with Walrus runtime, security teams monitoring WebAssembly supply chain risks, and infrastructure providers accepting untrusted WebAssembly modules from external sources.

Technical summary

The vulnerability stems from improper handling of deeply nested instructions in WebAssembly modules within the Walrus runtime. When processing a maliciously crafted module with excessive nesting depth, the runtime dereferences a NULL pointer, causing a crash and denial of service. The attack requires local access and user interaction to trigger, limiting its severity. The issue is specific to commit f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9 of the Samsung Walrus project. A remediation pull request has been submitted to address the underlying NULL pointer dereference condition.

Defensive priority

medium

Recommended defensive actions

  • Review and apply the fix from Samsung Walrus pull request 409 when available
  • Validate WebAssembly module nesting depth before processing untrusted inputs
  • Monitor Samsung Walrus repository for official security advisory and patched release
  • Implement input validation and sandboxing for WebAssembly execution environments
  • Assess exposure of Walrus-based services to untrusted WebAssembly module ingestion

Evidence notes

The CVE description identifies the affected component as Samsung Open Source Walrus, a WebAssembly runtime engine. The vulnerability is classified as CWE-476 (NULL Pointer Dereference). The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) indicates a local attack vector requiring user interaction, with high availability impact. A pull request addressing this issue has been submitted to the Samsung Walrus repository.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47307 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47307

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47307 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47307

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.