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CVE-2026-115383— Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via Tag Imports

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 47.0.0 至 48.0.4 之前的版本，以及 49.0.0 至 49.0.2 之前的版本，存在一个验证不当的漏洞。该漏洞允许接受其核心模块导入的 WebAssembly 标签（tag）为原始类型的子类型的组件。恶意客户端可通过错误构造异常对象载荷来破坏垃圾回收（GC）堆，从而在启用异常提案（exceptions proposal）时导致 Wasmtime 发生恐慌（panic）。

CVSS 4.8 · Medium

Affected Version Matrix 4

VendorProduct Version RangeStatus
bytecodealliance wasmtime 47.0.0< 48.0.4 affected
48.0.4 unaffected
49.0.0< 49.0.2 affected
49.0.2 unaffected
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I. Basic Information for CVE-2026-115383

Vulnerability Information
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Vulnerability Title
Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via Tag Imports
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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
CWE-1287
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bytecodealliance wasmtime 47.0.0 ~ 48.0.4 -

II. Public POCs for CVE-2026-115383

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III. Intelligence Information for CVE-2026-115383

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Other References for CVE-2026-115383 (2)

Same Patch Batch · bytecodealliance · 2026-10-22 · 15 CVEs total

CVE-2026-115384 9.9 CRITICAL Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow
CVE-2026-115392 7.9 HIGH Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47
CVE-2026-115388 6.2 MEDIUM Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion
CVE-2026-115385 6.2 MEDIUM Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Host Panic via WASIp3 Timestamps
CVE-2026-115387 6.2 MEDIUM Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host Panic via WAS
CVE-2026-115391 5.8 MEDIUM Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbounded Heap Allocation via WASIp
CVE-2026-115390 5.7 MEDIUM Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS
CVE-2026-115379 5.7 MEDIUM Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via try_call
CVE-2026-115382 4.8 MEDIUM Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS
CVE-2026-115381 4.8 MEDIUM Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Unbounded Host Mem
CVE-2026-115380 4.0 MEDIUM Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Fuel Limit Bypass
CVE-2026-115393 3.8 LOW Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47
CVE-2026-115386 2.6 LOW Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure
CVE-2026-115389 2.3 LOW Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Denial of Service

IV. Related Vulnerabilities

Same product: wasmtime
Same vendor: bytecodealliance
Same weakness: CWE-1287

V. Comments for CVE-2026-115383

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