CVE-2026-29645 | NEMU up to 2025.12.r1 RISC-V Vector Decoder funct3 denial of service (EUVD-2026-23937)

VDB-358354 · CVE-2026-29645 · EUVD-2026-23937 NEMU UP TO 2025.12.R1 RISC-V VECTOR DECODER FUNCT3 DENIAL OF SERVICE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.4 $0-$5k 8.16 Summaryinfo A vulnerability labeled as problematic has been found in NEMU up to 2025.12.r1. The impacted element is an unknown function of the component RISC-V Vector Decoder. Executing a manipulation of the argument funct3 can lead to denial of service. The identification of this vulnerability is CVE-2026-29645. There is no exploit available. The affected component should be upgraded. Detailsinfo A vulnerability classified as problematic was found in NEMU up to 2025.12.r1. This vulnerability affects an unknown part of the component RISC-V Vector Decoder. The manipulation of the argument funct3 with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes: NEMU (OpenXiangShan/NEMU) before v2025.12.r2 contains an improper instruction-validation flaw in its RISC-V Vector (RVV) decoder. The decoder does not correctly validate the funct3 field when decoding vsetvli/vsetivli/vsetvl, allowing certain invalid OP-V instruction encodings to be misinterpreted and executed as vset* configuration instructions rather than raising an illegal-instruction exception. This can be exploited by providing crafted RISC-V binaries to cause incorrect trap behavior, architectural state corruption/divergence, and potential denial of service in systems that rely on NEMU for correct execution or sandboxing. The advisory is available at github.com. This vulnerability was named CVE-2026-29645 since 03/04/2026. Technical details are known, but there is no available exploit. Upgrading to version 2025.12.r2 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-23937). Productinfo Name NEMU Version 2025.12.r1 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 3.5 VulDB Meta Temp Score: 3.4 VulDB Base Score: 3.5 VulDB Temp Score: 3.4 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: Denial of service CWE: CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No 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: NEMU 2025.12.r2 Timelineinfo 03/04/2026 CVE reserved 04/20/2026 +46 days Advisory disclosed 04/20/2026 +0 days VulDB entry created 04/20/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-29645 (🔒) GCVE (CVE): GCVE-0-2026-29645 GCVE (VulDB): GCVE-100-358354 EUVD: 🔒 Entryinfo Created: 04/20/2026 21:50 Updated: 04/20/2026 23:33 Changes: 04/20/2026 21:50 (55), 04/20/2026 23:33 (1) Complete: 🔍 Cache ID: 99:0C8:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸