What is the CVSS score of CVE-2026-47308?

CVE-2026-47308 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Samsung Walrus CVE-2026-47308

EUVD-2026-30836 HIGH

NULL Pointer Dereference (CWE-476)

2026-05-19 samsung.tv_appliance

GHSA-v22h-74vw-3j73

Samsung Null Pointer Dereference Denial Of Service Walrus

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Re-analysis Queued

Jul 24, 2026 - 12:22 vuln.today

cvss_changed

Severity Changed

Jul 24, 2026 - 12:22 NVD

MEDIUM HIGH

CVSS changed

Jul 24, 2026 - 12:22 NVD

5.5 (MEDIUM) 7.5 (HIGH)

Source Code Evidence Fetched

May 19, 2026 - 05:16 vuln.today

Analysis Generated

May 19, 2026 - 05:16 vuln.today

DescriptionNVD

NULL pointer dereference vulnerability in Samsung Open Source Walrus allows Pointer Manipulation.

This issue affects Walrus: f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9.

AnalysisAI

NULL pointer dereference in Samsung's open-source Walrus WebAssembly runtime crashes the parser when processing malformed WASM binaries, resulting in denial of service. The vulnerability exists in the WASMBinaryReader component (WASMParser.cpp) at commit f339b8ee4ea701772e8ae640b3d1b12ac02b1ae9, where multiple error-handling code paths fail to return early, allowing execution to continue past invalid state and dereference null pointers. No public exploit code has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.

Technical ContextAI

Walrus (cpe:2.3:a:samsung_open_source:walrus:*:*:*:*:*:*:*:*) is Samsung's open-source WebAssembly runtime engine, which relies on a forked and extended version of the wabt (WebAssembly Binary Toolkit) library for binary parsing. The vulnerability (CWE-476: NULL Pointer Dereference) resides in the WASMBinaryReader class within src/parser/WASMParser.cpp and its associated delegate in third_party/wabt/src/walrus/binary-reader-walrus.cc. The parser processes WASM binary sections sequentially; when a malformed or adversarially crafted WASM file triggers an internal parse error, the absence of early-return guards in at least eleven distinct code paths allows the parser to continue operating on invalid or null state. The fix in PR #409 adds explicit return statements at each of these paths, introduces a PARSER_RESOURCE_LIMIT check for local declaration counts, refactors m_walrusParseError storage from WASMBinaryReader into the base WASMBinaryReaderDelegate class, and adds a CheckParseError() method to BinaryReaderDelegateWalrus to propagate error state cleanly.

RemediationAI

The primary fix is to apply the upstream patch from GitHub PR #409 (https://github.com/Samsung/walrus/pull/409), which adds early-return guards throughout the WASM binary parser and introduces resource limit enforcement for local declarations. Upstream fix is available via the PR commit; a released patched version has not been independently confirmed, so consumers of Walrus should build from the patched branch or cherry-pick the changes into their deployment. Organizations that embed Walrus in a product should monitor the Samsung/walrus GitHub repository for a tagged stable release incorporating this fix. As a compensating control prior to patching, applications using Walrus should validate WASM binary inputs against a strict schema or byte-level allowlist before passing them to the parser, and should run the Walrus parser in an isolated process or sandbox so that a crash does not affect the broader application. Restricting the sources from which WASM binaries are accepted (e.g., rejecting user-supplied or externally-fetched WASM in production) directly reduces attack surface at the cost of reduced functionality.