{"id":"CVE-2020-18378","details":"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.","modified":"2026-07-08T22:14:31.691515Z","published":"2023-08-22T19:15:55.143Z","references":[{"type":"REPORT","url":"https://github.com/WebAssembly/binaryen/issues/1900"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/webassembly/binaryen","events":[{"introduced":"484f62f985cb2180139d1cf991ac04ee41635417"},{"last_affected":"484f62f985cb2180139d1cf991ac04ee41635417"}],"database_specific":{"cpe":"cpe:2.3:a:webassembly:binaryen:1.38.26:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.38.26"},{"last_affected":"1.38.26"}],"source":"CPE_STRING"}}],"versions":["1.38.26"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-18378.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}