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CVE-2026-119143— Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes

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 至 48.0.6 之前的版本，以及 49.0.0 至 49.0.3 之前的版本，存在一个拒绝服务漏洞。该漏洞允许 guest（客户）代码通过执行越界的零长度流操作，触发 host（宿主）恐慌（panic）。恶意 guest 可以对未经验证的地址执行零长度的组件模型流读取或写入操作，导致 Direct{Source,Destination}::remaining 发生恐慌，进而使 WASIp3 嵌入器崩溃。

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-119143

Vulnerability Information
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Vulnerability Title
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes
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 guest code to trigger a host panic through out-of-bounds zero-length stream operations. Malicious guests can perform zero-length component model stream reads or writes with unvalidated addresses, causing Direct{Source,Destination}::remaining to panic and crash WASIp3 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
对数组索引的验证不恰当
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-2026-119143

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III. Intelligence Information for CVE-2026-119143

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Other References for CVE-2026-119143 (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-2026-119136 4.8 MEDIUM Wasmtime 42.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Async-Entrypoint Enforcement Bypass
CVE-2026-119140 4.8 MEDIUM Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via thread.yield
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-129