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CVE-2026-119140— Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via thread.yield

Quick assessment

Affected
bytecodealliance wasmtime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wasmtime 46.0.0（48.0.6 之前版本）以及 49.0.0（49.0.3 之前版本）存在一个拒绝服务漏洞。该漏洞允许恶意组件通过在启动函数（start function）中调用 来触发宿主进程恐慌（panic）。攻击者可以提供一个组件，其启动函数先调用一个被异步降级（async-lowered）的导入函数，随后调用 ，从而导致未释放的协程（fiber）被丢弃，最终引发嵌入程序（embedders）崩溃。

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-119140

Vulnerability Information
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Vulnerability Title
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via thread.yield
Source: CVE Program / CVE List V5
Vulnerability 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 malicious components to panic the host via thread.yield in start functions. Attackers can supply a component whose start function calls an async-lowered import then thread.yield, causing an undisposed fiber drop that crashes embedders.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的内部状态区分
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bytecodealliance wasmtime 46.0.0 ~ 48.0.6 -

II. Public POCs for CVE-2026-119140

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III. Intelligence Information for CVE-2026-119140

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Other References for CVE-2026-119140 (2)

Same Patch Batch · bytecodealliance · 2026-10-29 · 14 CVEs total

CVE-2026-119134 6.2 MEDIUM Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 Unbounded Memory G
CVE-2026-119137 5.3 MEDIUM Wasmtime 42.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Stack Overflow via Type Registry
CVE-2026-119141 5.3 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via realloc
CVE-2026-119131 5.3 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via wasi-http
CVE-2026-119142 4.8 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via call_async Drop
CVE-2026-119138 4.8 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic After Trap
CVE-2026-119143 4.8 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes
CVE-2026-119136 4.8 MEDIUM Wasmtime 42.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Async-Entrypoint Enforcement Bypass
CVE-2026-119132 4.8 MEDIUM Wasmtime 49.0.0 before 49.0.3 Host Panic via Overlapping String Transcode in Fused Adapter
CVE-2026-119139 4.8 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via Func::call
CVE-2026-119135 4.8 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via StreamReader Type Mismatc
CVE-2026-119133 2.6 LOW Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Misaligned VMContext via Exception
CVE-2026-119130 2.6 LOW Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 HTTP Request Targe

IV. Related Vulnerabilities

Same product: wasmtime
Same vendor: bytecodealliance
Same weakness: CWE-372