{"schema":"threatline.record/2","record":{"id":"CVE-2026-115383","aliases":["GHSA-cfhf-m2cr-62wj"],"summary":"Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via Tag Imports","details":"Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains an improper validation vulnerability that accepts components whose core modules import WebAssembly tags with a subtype of the original type. Malicious guests can mis-type exception object payloads to corrupt the GC heap, causing Wasmtime to panic when the exceptions proposal is enabled.","categories":["Unclassified"],"product":"wasmtime","vendor":"bytecodealliance","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115383","source_modified_at":"2026-10-22T19:13:50.687Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"wasmtime","vendor":"bytecodealliance","versions":[{"lessThan":"48.0.4","status":"affected","version":"47.0.0","versionType":"semver"},{"status":"unaffected","version":"48.0.4","versionType":"semver"},{"lessThan":"49.0.2","status":"affected","version":"49.0.0","versionType":"semver"},{"status":"unaffected","version":"49.0.2","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj","source_modified_at":"2026-10-23T18:37:51Z","fetched_at":"2026-10-24T14:26:37.433577Z","package":{"ecosystem":"rust","name":"wasmtime"},"range":">= 47.0.0, < 48.0.4"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj","source_modified_at":"2026-10-23T18:37:51Z","fetched_at":"2026-10-24T14:26:37.433577Z","package":{"ecosystem":"rust","name":"wasmtime"},"range":">= 49.0.0, < 49.0.2"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115383","source_modified_at":"2026-10-22T19:13:50.687Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"wasmtime","ecosystem":null},"version":"48.0.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115383","source_modified_at":"2026-10-22T19:13:50.687Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"wasmtime","ecosystem":null},"version":"49.0.2","basis":"first unaffected version stated in the CVE record"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj","source_modified_at":"2026-10-23T18:37:51Z","fetched_at":"2026-10-24T14:26:37.433577Z","package":{"ecosystem":"rust","name":"wasmtime"},"version":"48.0.4"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj","source_modified_at":"2026-10-23T18:37:51Z","fetched_at":"2026-10-24T14:26:37.433577Z","package":{"ecosystem":"rust","name":"wasmtime"},"version":"49.0.2"}],"cvss":5.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00183,"percentile":0.07519,"score_date":"2026-10-23"},"published_at":"2026-10-22T19:13:50.687Z","modified_at":"2026-10-23T18:37:51Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-115383","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-22T19:13:50.687Z"},{"source":"GitHub Advisory Database","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj","fetched_at":"2026-10-24T14:26:37.433577Z","source_modified_at":"2026-10-23T18:37:51Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-115383","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.4-and-49.0.0-before-49.0.2-gc-heap-corruption-via-tag-imports","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-23T18:37:51Z","content_hash":"71f11b82a0a18958f230fb216f99df721ba6dbc66f077bd6777715e2c3062f97"}}