Read the docs
TI-2026-23352 Aliases CVE-2026-29645GHSA-prqq-qrc5-xvpr

NEMU (OpenXiangShan/NEMU) before v2025.12.r2 contains an improper instruction-validation…

Priority MEDIUM 40CWE-1287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-131 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00543 45th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:xiangshan:nemu:2025.12:r1:*:*:*:*:*:*2025.12 r1VulnerableXiangshan
  • cpe:2.3:a:xiangshan:nemu:2025.12:r1:*:*:*:*:*:* Versions 2025.12 r1 Vulnerable ·Xiangshan

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29645
  2. 2026-10-03 Alias added: GHSA-prqq-qrc5-xvpr
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 1

Other 3

  • TI-2026-23356 NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where… CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences