Heap-buffer-overflow in /src/wasm/wasm-binary.cpp in…
Priority MEDIUM 62CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
Heap-buffer-overflow in /src/wasm/wasm-binary.cpp in wasm::WasmBinaryBuilder::visitBlock(wasm::Block*) in Binaryen 1.38.26. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-opt.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00618 49th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:webassembly:binaryen:1.38.26:*:*:*:*:*:*:* | 1.38.26 | Vulnerable | WebAssembly |
- cpe:2.3:a:webassembly:binaryen:1.38.26:*:*:*:*:*:*:* Versions 1.38.26 Vulnerable ·WebAssembly
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-18382
- 2026-10-03 Alias added: GHSA-g8f7-3qc2-97wh
References
More WebAssembly Binaryen vulnerabilities
- TI-2020-13373 A NULL pointer dereference was discovered in SExpressionWasmBuilder::makeBlock in… CVSS 3.1MEDIUM 6.5
- TI-2026-07277 WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion CVSS 4.0MEDIUM 4.8
- TI-2021-20472 A Denial of Service vulnerability exits in Binaryen 103 due to an assertion abort in wasm::handle_unreachable. CVSS 3.1HIGH 7.5
- TI-2019-05428 In Binaryen 1.38.22, there is a use-after-free problem in… CVSS 3.1MEDIUM 6.5
- TI-2019-05400 An assertion failure was discovered in wasm::WasmBinaryBuilder::getType() in… CVSS 3.1MEDIUM 6.5
- TI-2019-11837 An issue was discovered in Binaryen 1.38.32. CVSS 3.1MEDIUM 6.5
Sources
- CVE-2020-18382 · CVE Program
- CVE-2020-18382 · NVD
- FIRST EPSS
- GHSA-g8f7-3qc2-97wh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences