In Binaryen 1.38.22, there is a use-after-free problem in…
Priority LOW 32CWE-416Published · 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-416 and the CVSS impact.
Summary
In Binaryen 1.38.22, there is a use-after-free problem in wasm::WasmBinaryBuilder::visitCall in wasm-binary.cpp. Remote attackers could leverage this vulnerability to cause a denial-of-service via a wasm file, as demonstrated by wasm-merge.
Why it matters now
EPSS 0.01459 73rd 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
Not available: CISA has not published SSVC decision points for this record.
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:*:*:*:*:*:*:*:* | before 64 | Vulnerable | WebAssembly |
- cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:* Versions before 64 Vulnerable ·WebAssembly
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-7703
- 2026-10-03 Alias added: GHSA-9w62-w3v4-9qmp
References
More WebAssembly Binaryen vulnerabilities
- TI-2020-13374 Heap-buffer-overflow in /src/wasm/wasm-binary.cpp in… CVSS 3.1MEDIUM 6.5
- 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-2019-05400 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-2019-7703 · CVE Program
- CVE-2019-7703 · NVD
- FIRST EPSS
- GHSA-9w62-w3v4-9qmp · GitHub Advisory Database · CC BY 4.0
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