What is CVE-2026-29645?

CVE-2026-29645 is a high-severity vulnerability in Xiangshan Nemu, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2026-04-20.

How severe is CVE-2026-29645?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Xiangshan Nemu

CVE-2026-29645

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 cert…

EPSS: 0.005 (42.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Xiangshan Nemu — versions 2025.12
N/a — versions n/a

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size
CWE-1287

References

cve@mitre.org (Issue Tracking)
cve@mitre.org (Issue Tracking)
cve@mitre.org (Patch)
cve@mitre.org (Product)

Frequently asked questions

What is CVE-2026-29645?: CVE-2026-29645 is a high-severity vulnerability in Xiangshan Nemu, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2026-04-20.
How severe is CVE-2026-29645?: High severity. CVSS v3 base score is 7.5 out of 10.