Security readout for executives and security teams
Plain-English summary
CVE-2020-18382 describes a crash risk in Binaryen 1.38.26 when processing a crafted WebAssembly file. The known impact is denial of service: the tool can segment fault, including through wasm-opt. Sources do not show active exploitation, business impact depends on whether Binaryen handles untrusted wasm in CI, build, or analysis workflows.
Executive priority
Prioritize if WebAssembly files from outside the organization enter build or analysis pipelines. Otherwise, handle through normal dependency hygiene while monitoring vendor guidance.
Technical view
The reported flaw is a heap-buffer-overflow in src/wasm/wasm-binary.cpp, specifically wasm::WasmBinaryBuilder::visitBlock(wasm::Block*) in Binaryen 1.38.26. A crafted wasm input can trigger a segmentation fault. The provided record has no CVSS, CWE, CPE, or complete affected-product metadata.
Likely exposure
Exposure is most likely where Binaryen 1.38.26 or wasm-opt processes wasm supplied by users, customers, external repositories, fuzzing corpora, or automated build inputs. Internal-only use on trusted wasm is lower concern.
Exploitation context
The source bundle supports crafted-input denial of service, not code execution or data theft. KEV is false, and no cited source states active exploitation in the wild.
Researcher notes
Evidence is sparse: the record names Binaryen 1.38.26 and a heap-buffer-overflow causing segmentation fault, but lacks CVSS, CWE, CPE, and explicit fix information. Avoid broader claims without upstream confirmation.
Mitigation direction
- Identify any Binaryen or wasm-opt installations and versions.
- Check Binaryen upstream guidance for fixed releases or recommended workarounds.
- Avoid processing untrusted wasm with affected tooling until remediated.
- Run wasm processing in isolated, resource-limited build environments.
- Limit external wasm ingestion in CI and automated analysis pipelines.
Validation and detection
- Inventory repositories, CI images, build containers, and developer machines for Binaryen.
- Confirm whether version 1.38.26 is present anywhere.
- Map workflows that pass external or user-supplied wasm to wasm-opt.
- Review crash reports for Binaryen segmentation faults during wasm processing.
- Track the CVE record and GitHub issue for updated affected-version details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2020-18382 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/WebAssembly/binaryen/issues/1900CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.