{"id":"CVE-2026-119138","kind":"vulnerability","aliases":["CVE-2026-119138"],"related":[],"title":"Wasmtime: crafted guest code crashes hosts reusing a poisoned Store","description":"Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows pending calls to trigger an assertion failure after a trap poisons the Store. Attackers supplying misbehaving guest code can cause a trap and let earlier calls proceed, crashing embedders that continue using the inconsistent Store.","summary":"Wasmtime versions 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 let pending calls hit an assertion failure after a trap poisons the Store. Attackers who supply misbehaving guest code can crash embedders that keep using the inconsistent Store, causing denial of service.","severity":"medium","cvss":5.9,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["runtime","rust","wasmtime","webassembly"],"not_affected_if":["no-store-reuse-after-trap","trusted-guest-code-only"],"how_to_check":"- Check the Wasmtime version in your dependencies, for example `wasmtime --version` or the `wasmtime` entry in `Cargo.lock`\n- Look for embedders that keep calling into a Store after a trap and run untrusted guest code","fix":"- Wasmtime `48.0.6` for the 46/48 line\n- Wasmtime `49.0.3` for the 49 line","status":"open","published_at":"2026-10-29T16:18:07+00:00","first_seen_at":"2026-10-29T16:25:58+00:00","triaged_at":"2026-10-29T16:31:39+00:00","updated_at":"2026-10-29T16:31:39+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-29T16:31:39Z","model":"claude-haiku-5-5","output":{"fix":"- Wasmtime `48.0.6` for the 46/48 line\n- Wasmtime `49.0.3` for the 49 line","reach":"unknown","title":"Wasmtime: crafted guest code crashes hosts reusing a poisoned Store","impact":"low","summary":"Wasmtime versions 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 let pending calls hit an assertion failure after a trap poisons the Store. Attackers who supply misbehaving guest code can crash embedders that keep using the inconsistent Store, causing denial of service.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["wasmtime","webassembly","rust"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Host process crashes when embedder reuses poisoned Store","analyst_note":"","how_to_check":"- Check the Wasmtime version in your dependencies, for example `wasmtime --version` or the `wasmtime` entry in `Cargo.lock`\n- Look for embedders that keep calling into a Store after a trap and run untrusted guest code","plain_action":"","needs_analyst":false,"not_affected_if":["trusted-guest-code-only","no-store-reuse-after-trap"],"who_is_affected":"Applications that embed Wasmtime to run untrusted WebAssembly guest code and keep using a Store after a trap. Services that only run trusted modules or never reuse a Store after a trap are less exposed. unknown whether other configurations are affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000706,"input_tokens":4169,"output_tokens":579,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119138':13A,16A '-2026':12A,15A '46.0.0':23B,63C '48.0.6':25B,65C '49.0.0':27B,67C '49.0.3':29B,69C 'allow':77C 'assert':35B,83C 'attack':43B,91C 'call':32B,79C,103C 'caus':58B,97C 'code':4A,48B,95C 'contain':70C 'continu':108C 'craft':2A 'crash':5A,50B,105C 'cve':11A,14A 'denial':59B,72C 'earlier':102C 'embedd':51B,106C 'failur':36B,84C 'guest':3A,47B,94C 'hit':33B 'host':6A 'inconsist':56B,111C 'keep':53B 'let':30B,101C 'misbehav':46B,93C 'pend':31B,78C 'poison':9A,40B,88C 'proceed':104C 'reus':7A 'runtim':17B 'rust':18B 'servic':61B,74C 'store':10A,42B,57B,90C,112C 'suppli':45B,92C 'trap':39B,87C,99C 'trigger':81C 'use':54B,109C 'version':22B 'vulner':75C 'wasmtim':1A,19B,21B,62C 'webassembl':20B","nicknames":[],"mitigations":[],"who_affected":"Applications that embed Wasmtime to run untrusted WebAssembly guest code and keep using a Store after a trap. Services that only run trusted modules or never reuse a Store after a trap are less exposed. unknown whether other configurations are affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T16:18:07+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-119138","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119138","severity":null,"published_at":"2026-10-29T16:18:07+00:00","modified_at":"2026-10-29T16:18:07+00:00","first_seen_at":"2026-10-29T16:25:58+00:00","fetched_at":"2026-10-29T16:25:58+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}