{"id":"CVE-2026-115383","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.","aliases":["GHSA-cfhf-m2cr-62wj","RUSTSEC-2026-0325"],"modified":"2026-11-05T21:15:51.144604048Z","published":"2026-10-22T19:13:50.687Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-1287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115383.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115383.json"},{"type":"ADVISORY","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115383"},{"type":"ADVISORY","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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bytecodealliance/wasmtime","events":[{"introduced":"39d67168cdb6911ffdc961381314b6fed62e3c93"},{"fixed":"d02ffd202850007ea953224f589a569e8830eb6c"},{"introduced":"17830bd3c0331d920a8aa38846eebc4d46d98c23"},{"fixed":"3c8a3e79aa3188a1a12b3aebbaa097abccceac92"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"47.0.0"},{"fixed":"48.0.4"}],"source":"AFFECTED_FIELD"},{"range":[{"introduced":"49.0.0"},{"fixed":"49.0.2"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}}],"versions":["v49.0.1","v49.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115383.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}