bytecodealliance wasmtime up to 24.0.6/36.0.6/42.0.1/44.0.0 uncaught exception

CVSS Meta Temp Score
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in bytecodealliance wasmtime up to 24.0.6/36.0.6/42.0.1/44.0.0 and classified as problematic. This vulnerability affects unknown code. Performing a manipulation results in uncaught exception. This vulnerability is reported as CVE-2026-34944. The attack requires a local approach. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in bytecodealliance wasmtime up to 24.0.6/36.0.6/42.0.1/44.0.0. It has been classified as problematic. This affects an unknown part. The manipulation with an unknown input leads to a uncaught exception vulnerability. CWE is classifying the issue as CWE-248. An exception is thrown from a function, but it is not caught. This is going to have an impact on availability. The summary by CVE is:

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can result in a uncaught segfault due to loading from unmapped guard pages. With guard pages disabled it's possible for out-of-sandbox data to be loaded, but this data is not visible to WebAssembly guests. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-34944 since 03/31/2026. The exploitability is told to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 305821 (Linux Distros Unpatched Vulnerability : CVE-2026-34944), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 24.0.7, 36.0.7, 42.0.2 or 44.0.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (305821). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uncaught exception
CWE: CWE-248
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305821
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-34944

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: wasmtime 24.0.7/36.0.7/42.0.2/44.0.1

Timelineinfo

03/31/2026 CVE reserved
04/09/2026 +9 days Advisory disclosed
04/09/2026 +0 days VulDB entry created
04/10/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-qqfj-4vcm-26hv
Status: Confirmed

CVE: CVE-2026-34944 (🔒)
GCVE (CVE): GCVE-0-2026-34944
GCVE (VulDB): GCVE-100-356667

Entryinfo

Created: 04/09/2026 22:04
Updated: 04/10/2026 14:55
Changes: 04/09/2026 22:04 (66), 04/10/2026 14:55 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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