CVE-2026-29645

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Source
https://cve.org/CVERecord?id=CVE-2026-29645
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29645.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-29645
Published
2026-04-20T00:00:00Z
Modified
2026-07-15T01:49:11.692897869Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29645.json",
    "cna_assigner": "mitre"
}
References

Affected packages

Git / github.com/openxiangshan/nemu

Affected ranges

Type
GIT
Repo
https://github.com/openxiangshan/nemu
Events
Introduced
304d1da6a1bae861be9dbf2f6a299cf1c47f383d
Fixed
481de637d5fc5838356caee80a79e56a33754039
Database specific 
{
    "extracted_events": [
        {
            "introduced": "2025.12-r1"
        },
        {
            "last_affected": "2025.12-r1"
        }
    ],
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:xiangshan:nemu:2025.12:r1:*:*:*:*:*:*"
}

Affected versions

2025.*
2025.12-r1
v2025.*
v2025.12.r1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29645.json"