CVE-2026-115383 (GCVE-0-2026-115383)

Vulnerability from cvelistv5 – Published: 2026-10-22 19:13 – Updated: 2026-10-22 19:13
VLAI
Title
Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via Tag Imports
Summary
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.
Severity
5.9 (Medium)
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
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
CWE
  • CWE-1287 - Improper Validation of Specified Type of Input
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6762 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
bytecodealliance wasmtime Affected: 47.0.0 , < 48.0.4 (semver)
Unaffected: 48.0.4 (semver)
Affected: 49.0.0 , < 49.0.2 (semver)
Unaffected: 49.0.2 (semver)
    cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*
    cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-10-02 00:00
Show details on NVD website
To clipboard 

{
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          "name": "GitHub Security Advisory (GHSA-cfhf-m2cr-62wj)",
          "tags": [
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          "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-cfhf-m2cr-62wj"
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    "datePublished": "2026-10-22T19:13:50.687Z",
    "dateReserved": "2026-10-22T11:25:27.610Z",
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}



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