CVE-2026-35195

Published: Apr 09, 2026 Last Modified: Apr 15, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,1
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
MEDIUM 5,4
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: low
Integrity: low
Availability: none

Description

AI Translation Available

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings between components contains a bug where the return value of a guest component's realloc is not validated before the host attempts to write through the pointer. This enables a guest to cause the host to write arbitrary transcoded string bytes to an arbitrary location up to 4GiB away from the base of linear memory. These writes on the host could hit unmapped memory or could corrupt host data structures depending on Wasmtime's configuration. Wasmtime by default reserves 4GiB of virtual memory for a guest's linear memory meaning that this bug will by default on hosts cause the host to hit unmapped memory and abort the process due to an unhandled fault. Wasmtime can be configured, however, to reserve less memory for a guest and to remove all guard pages, so some configurations of Wasmtime may lead to corruption of data outside of a guest's linear memory, such as host data structures or other guests's linear memories. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0001
Percentile
0,0th
Updated

EPSS Score Trend (Last 7 Days)

787

Out-of-bounds Write

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Availability Other
Potential Impacts:
Modify Memory Execute Unauthorized Code Or Commands Dos: Crash, Exit, Or Restart Unexpected State
Applicable Platforms
Languages: Assembly, C, C++, Memory-Unsafe
Technologies: ICS/OT
Likelihood of Exploit: High
View CWE Details
Application

Wasmtime by Bytecodealliance

Product Information
Vendor Bytecodealliance
Product Wasmtime
Version Range Affected
From 37.0.0 (inclusive)
To 42.0.2 (exclusive)
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Wasmtime by Bytecodealliance

Product Information
Vendor Bytecodealliance
Product Wasmtime
Version Range Affected
To 24.0.7 (exclusive)
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Wasmtime by Bytecodealliance

Product Information
Vendor Bytecodealliance
Product Wasmtime
Version 43.0.0
cpe:2.3:a:bytecodealliance:wasmtime:43.0.0:*:*:*:*:rust:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Wasmtime by Bytecodealliance

Product Information
Vendor Bytecodealliance
Product Wasmtime
Version Range Affected
From 25.0.0 (inclusive)
To 36.0.7 (exclusive)
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/bytecodealliance/wasmtime/security/advis…
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-394w-hwhg…