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  4. CVE 2026 54913 webassembly micro runtime missing refnull heap
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Back to active CVEs
Medium · CVSS 6.9CVE-2026-54913

WebAssembly Micro Runtime: Missing `ref.null` heap-type validation in `load_init_expr` leaks host stack memory to the WebAssembly guestCVE-2026-54913

Answer in brief

CVE-2026-54913 records a Medium severity (CVSS 6.9) vulnerability in WebAssembly Micro Runtime: Missing `ref.null` heap-type validation in `load_init_expr` leaks host stack memory to the WebAssembly guest. The current sources do not mark it as known exploited. The current feed maps bytecodealliance/wasm-micro-runtime (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 5, 2026Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-457
Source
CVE List V5
Source checked
Nov 5, 2026
References
4 linked sources
Open source record

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps bytecodealliance/wasm-micro-runtime (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
bytecodealliance/wasm-micro-runtimegeneric<2.4.52.4.5

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for bytecodealliance/wasm-micro-runtime.
  2. 2Review the reported fix. Update bytecodealliance/wasm-micro-runtime to 2.4.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to 2.4.5, load_init_expr in core/iwasm/interpreter/wasm_loader.c accepts a non-reference heap-type byte for ref.null when WASM_ENABLE_GC=0, while the local WASMValue cur_value union is not zero-initialized and setting ref_index writes only part of it. A crafted module can declare an i64, f64, or v128 global initialized through the invalid ref.null form, causing push_const_expr_stack and the later global initialization path to copy uninitialized host-stack bytes into a value readable by the guest. The classic and fast interpreters are affected in the default no-GC configuration; the GC-enabled path validates heap types. The disclosure is four bytes for i64 or f64 globals and up to twelve bytes for each v128 global. This issue is fixed in version 2.4.5.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • WAMR fast interpreter loader heap buffer overflow via constant deduplication mismatchSame bytecodealliance/wasm-micro-runtime package
  • WebAssembly Micro Runtime: Heap Buffer Overflow in WAMR WASI poll_oneoff Output BufferSame bytecodealliance/wasm-micro-runtime package