Vulnerability DatabaseCVE-2026-119134
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CVE-2026-119134
Published:October 29, 2026
Updated:October 30, 2026
Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 caps component-model resource handle tables only per component instance and does not charge handle allocations to any ResourceLimiter or StoreLimits. A malicious guest can repeatedly call resource.new and instantiate sub-components to exceed the per-instance cap many times over, causing unbounded host memory growth.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) =v50.0.0-rc.1 <v50.0.0
Fix Suggestion:
Update to version v50.0.0
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v12.0.0 <v36.0.18 || >=v13.0.0 <v36.0.18 || >=v14.0.0 <v36.0.18 || >=v15.0.0 <v36.0.18 || =v16.0.0 <v36.0.18 || >=v17.0.0 <v36.0.18 || >=v18.0.0 <v36.0.18 || >=v19.0.0 <v36.0.18 || >=v20.0.0 <v36.0.18 || >=v21.0.0 <v36.0.18 || >=v22.0.0 <v36.0.18 || >=v23.0.0 <v36.0.18 || >=v24.0.0 <v36.0.18 || >=v25.0.0 <v36.0.18 || >=v26.0.0 <v36.0.18 || =v27.0.0 <v36.0.18 || >=v28.0.0 <v36.0.18 || >=v29.0.0 <v36.0.18 || >=v30.0.0 <v36.0.18 || =v31.0.0 <v36.0.18 || >=v32.0.0 <v36.0.18 || >=v33.0.0 <v36.0.18 || >=v34.0.0 <v36.0.18 || =v35.0.0 <v36.0.18 || >=v36.0.0 <v36.0.18
Fix Suggestion:
Update to version v36.0.18
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v37.0.0 <v48.0.6 || >=v38.0.1 <v48.0.6 || >=v39.0.0 <v48.0.6 || >=v40.0.0 <v48.0.6 || >=v41.0.0 <v48.0.6 || >=v42.0.0 <v48.0.6 || >=v43.0.0 <v48.0.6 || >=v44.0.0 <v48.0.6 || >=v45.0.0 <v48.0.6 || >=v46.0.0 <v48.0.6 || >=v47.0.0 <v48.0.6 || >=v48.0.0 <v48.0.6
Fix Suggestion:
Update to version v48.0.6
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v49.0.0-rc.1 <v49.0.3
Fix Suggestion:
Update to version v49.0.3
wasmtime (RUST):
Affected version(s) >=12.0.0 <36.0.18 || >=13.0.0 <36.0.18 || >=14.0.0 <36.0.18 || >=15.0.0 <36.0.18 || =16.0.0 <36.0.18 || >=17.0.0 <36.0.18 || >=18.0.0 <36.0.18 || >=19.0.0 <36.0.18 || >=20.0.0 <36.0.18 || >=21.0.0 <36.0.18 || >=22.0.0 <36.0.18 || >=23.0.0 <36.0.18 || >=24.0.0 <36.0.18 || >=25.0.0 <36.0.18 || >=26.0.0 <36.0.18 || =27.0.0 <36.0.18 || >=28.0.0 <36.0.18 || >=29.0.0 <36.0.18 || >=30.0.0 <36.0.18 || =31.0.0 <36.0.18 || >=32.0.0 <36.0.18 || >=33.0.0 <36.0.18 || >=34.0.0 <36.0.18 || =35.0.0 <36.0.18 || >=36.0.0 <36.0.18
Fix Suggestion:
Update to version 36.0.18
wasmtime (RUST):
Affected version(s) >=37.0.0 <48.0.6 || >=38.0.0 <48.0.6 || >=39.0.0 <48.0.6 || >=40.0.0 <48.0.6 || >=41.0.0 <48.0.6 || >=42.0.0 <48.0.6 || >=43.0.0 <48.0.6 || >=44.0.0 <48.0.6 || >=45.0.0 <48.0.6 || >=46.0.0 <48.0.6 || >=47.0.0 <48.0.6 || >=48.0.0 <48.0.6
Fix Suggestion:
Update to version 48.0.6
wasmtime (RUST):
Affected version(s) =50.0.0-rc.1 <50.0.0
Fix Suggestion:
Update to version 50.0.0
wasmtime (RUST):
Affected version(s) >=49.0.0-rc.1 <49.0.3
Fix Suggestion:
Update to version 49.0.3
Related Resources (2)
https://www.vulncheck.com/advisories/wasmtime-before-36.0.18-37.0.0-before-48.0.6-and-49.0.0-before-49.0.3-unbounded-memory-growth-via-component-model-resource-handles
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q554-3cjc-rx7p
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CVSS v4
Base Score:
6.9
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.2
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
CWE-770