CVE-2026-119143 Details
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.
A denial-of-service vulnerability has been identified in Wasmtime versions 46.0.0 prior to 48.0.6 and 49.0.0 prior to 49.0.3. This vulnerability allows guest code to cause a host panic by performing out-of-bounds stream operations with zero-length reads or writes. Malicious guests can exploit this by using unvalidated addresses, leading to a crash in WASIp3 embedders that utilize the Direct{Source,Destination}::remaining method.
Users can upgrade to Wasmtime versions 48.0.6 or 49.0.3 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 29, 2026CISA-ADP
Assessed Nov 4, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-129 | Improper Validation of Array Index | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| bytecodealliance Wasmtime | >= 46.0.0, < 48.0.6 (semver) >= 49.0.0, < 49.0.3 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | CVE Modified | CISA-ADP |
| Oct 29, 2026 | New CVE Received | [email protected] |