What is CVE-2023-31722?

CVE-2023-31722 is a high-severity vulnerability in Nasm Netwide Assembler, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2023-05-17.

How severe is CVE-2023-31722?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2023-31722 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Nasm Netwide Assembler

CVE-2023-31722

There exists a heap buffer overflow in nasm 2.16.02rc1 (GitHub commit: b952891).

Vulnerability class: Buffer Overflow

Published 2023-05-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (26.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Nasm Netwide Assembler — versions 2.16.02

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

bugzilla.nasm.us/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-31722?: CVE-2023-31722 is a high-severity vulnerability in Nasm Netwide Assembler, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2023-05-17.
How severe is CVE-2023-31722?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2023-31722 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.