CVE-2026-34944 | bytecodealliance wasmtime up to 24.0.6/36.0.6/42.0.1/44.0.0 uncaught exception (GHSA-qqfj-4vcm-26hv)

VDB-356667 · CVE-2026-34944 · GHSA-QQFJ-4VCM-26HV BYTECODEALLIANCE WASMTIME UP TO 24.0.6/36.0.6/42.0.1/44.0.0 UNCAUGHT EXCEPTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.2 $0-$5k 0.84 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. Upgrading to version 24.0.7, 36.0.7, 42.0.2 or 44.0.1 eliminates this vulnerability. Productinfo Vendor bytecodealliance Name wasmtime Version 24.0.0 24.0.1 24.0.2 24.0.3 24.0.4 24.0.5 24.0.6 36.0.0 36.0.1 36.0.2 36.0.3 36.0.4 36.0.5 36.0.6 42.0.0 42.0.1 44.0 Website Product: https://github.com/bytecodealliance/wasmtime/ 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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 04/09/2026 +0 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 Changes: 04/09/2026 22:04 (66) Complete: 🔍 Cache ID: 99:F18:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸