Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via Tag Imports
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.
CVE-2026-115383
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-115383
wasmtime
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "bytecodealliance",
"product": "wasmtime",
"versions": [
{
"status": "affected",
"version": "47.0.0",
"lessThan": "48.0.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "48.0.4",
"versionType": "semver"
},
{
"status": "affected",
"version": "49.0.0",
"lessThan": "49.0.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "49.0.2",
"versionType": "semver"
}
],
"packageURL": "pkg:cargo/wasmtime",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115383
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #52338 · Revision 1
- Added to Heist Feed
- Publisher date