CVE-2026-119132 Details
Description
Wasmtime from 49.0.0 before 49.0.3 contains a denial-of-service vulnerability that allows a WebAssembly guest to trigger a host panic by transcoding overlapping strings in fused adapters. Attackers can make a same-instance component-to-component call transferring a string whose source and destination alias each other, crashing the host instead of raising a trap.
A denial-of-service vulnerability has been identified in Wasmtime versions 49.0.0 prior to 49.0.3. This vulnerability allows a WebAssembly guest to cause a host panic by transcoding overlapping strings in fused adapters. The issue arises when a same-instance component-to-component call is made, transferring a string whose source and destination alias each other. Instead of raising a trap as intended, this operation crashes the host.
Users can upgrade to Wasmtime version 49.0.3 or later 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 3, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-617 | Reachable Assertion | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| bytecodealliance Wasmtime | >= 49.0.0, <= 49.0.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 3, 2026 | CVE Modified | CISA-ADP |
| Oct 29, 2026 | New CVE Received | [email protected] |