# CVE-2026-29645: Other in n/a

> Attackers can cause denial of service and state corruption in NEMU by providing crafted RISC-V binaries that exploit improper instruction validation in the RVV decoder.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Apr 2026
- **Updated:** 21 Apr 2026
- **Also known as:** GHSA-prqq-qrc5-xvpr

## What is CVE-2026-29645?

CVE-2026-29645 is a high-severity vulnerability in n/a, published on 20 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-131 (Incorrect Calculation of Buffer Size), CWE-1287 (Improper Validation of Specified Type of Input)

## Which versions are affected by CVE-2026-29645?

It affects 1 product.


Products: Xiangshan Nemu.

## How do I fix CVE-2026-29645?

No fix has been published for CVE-2026-29645 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-29645 being exploited?

There is no known exploitation of CVE-2026-29645 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2026-29649](https://insights.sbomify.com/CVE-2026-29649/): Other in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-29645 and fix it if it is affected.

What it is: CVE-2026-29645 is a high-severity vulnerability in n/a, published on 20 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-29645 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-29645/ (Markdown: https://insights.sbomify.com/CVE-2026-29645/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29645
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29645
- OSV: https://osv.dev/vulnerability/CVE-2026-29645

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-29645/
Summaries are generated and may contain mistakes; the official description above is the record.