A NULL pointer dereference was discovered in SExpressionWasmBuilder::makeBlock in wasm/wasm-s-parser.c in Binaryen 1.38.26. A crafted wasm input can cause a segmentation fault, leading to denial-of-service, as demonstrated by wasm-as.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Binaryen | Webassembly | 1.38.26 (including) | 1.38.26 (including) |
| Binaryen | Ubuntu | bionic | * |
| Binaryen | Ubuntu | focal | * |
| Binaryen | Ubuntu | lunar | * |
| Binaryen | Ubuntu | mantic | * |
| Binaryen | Ubuntu | oracular | * |
| Binaryen | Ubuntu | plucky | * |
| Binaryen | Ubuntu | trusty | * |
| Binaryen | Ubuntu | xenial | * |