# CVE-2026-47307: Samsung Walrus NULL pointer dereference in WebAssembly engine

Source: https://junglewise.ai/threats/cve-2026-47307-samsung-walrus-null-pointer-dereference-in-webassembly-engine  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-19. Updated: 2026-05-19  
License: CC BY 4.0 with a link back

CVE-2026-47307 · Severity: medium · CVSS 5.5 · Published 2026-05-19

Samsung Walrus, an open-source WebAssembly engine, is vulnerable to a flaw that can cause the application to crash. By providing a specially crafted WebAssembly module with deeply nested instructions, an attacker can trigger a system failure. This results in a denial of service, potentially disrupting operations or services that rely on this engine to execute code.

Technologies: [Samsung Walrus](https://junglewise.ai/threats/technologies/walrus). Vendors: [Samsung](https://junglewise.ai/threats/vendors/samsung).

## Quick answers

**Is CVE-2026-47307 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-47307 being exploited in the wild.

**How severe is CVE-2026-47307?** Medium severity, with a CVSS score of 5.5, published 19 May 2026.

**Which products and versions are affected?** Samsung Walrus f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9.

**Is there a fix for CVE-2026-47307?** A patch was published on 2026-04-28: Fix merged in GitHub pull request #409 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-47307 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-47307?** Check whether you run Samsung Walrus at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A NULL pointer dereference (CWE-476) exists in the Samsung Walrus WebAssembly engine. The vulnerability is triggered during the parsing or execution of a crafted WebAssembly module that contains deeply nested instructions, which likely exhausts resources or fails to handle recursion depth correctly, resulting in a NULL pointer access. An attacker can achieve a denial of service (DoS) by convincing a user or system to process the malicious module. The issue was addressed in pull request #409, which improved error handling and resource limits.

## Affected products

- Samsung Walrus f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9

## Timeline

- 2026-04-28: patched: Fix merged in GitHub pull request #409
- 2026-05-19: disclosed: CVE published to NVD

## References

- [https://github.com/Samsung/walrus/pull/409](https://github.com/Samsung/walrus/pull/409)

## Related threats

- [Samsung Walrus integer overflow in memory bounds check](https://junglewise.ai/threats/cve-2026-86314-samsung-walrus-integer-overflow-in-memory-bounds-check)
- [Samsung Walrus out-of-bounds write buffer overflow](https://junglewise.ai/threats/cve-2026-86313-samsung-walrus-out-of-bounds-write-buffer-overflow)
- [Samsung Walrus NULL pointer dereference](https://junglewise.ai/threats/cve-2026-47308-samsung-walrus-null-pointer-dereference)