# CVE-2026-29645

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-29645
- **Published:** 2026-04-20
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-131, CWE-1287

## Affected products

- `xiangshan:nemu`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29645

## Citation

> AI Analytics. CVE-2026-29645. Retrieved 2026-07-07 from https://api.ai-analytics.org/cve/CVE-2026-29645. Derived from NIST NVD. Licensed CC0.

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