CVE-2023-31973

MEDIUMNVD 5.55.5—

5.5

yasm v1.3.0 was discovered to contain a use after free via the function expand_mmac_params at /nasm/nasm-pp.c. Note: Multiple third parties dispute this as a bug and not a vulnerability according to the YASM security policy.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 33.1%
KEV: Not listed

Published

May 9, 2023

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://github.com/yasm/yasm/issues/207
af854a3a-2127-422b-91ae-364da2661108https://github.com/yasm/yasm/issues/207

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 01:36 UTCEG score recompute
2026-05-25 01:36 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-31973?

CVE-2023-31973 is a medium vulnerability published on May 9, 2023. yasm v1.3.0 was discovered to contain a use after free via the function expandmmacparams at /nasm/nasm-pp.c. Note: Multiple third parties dispute this as a bug and not a vulnerability according to the YASM security policy.

When was CVE-2023-31973 disclosed?

CVE-2023-31973 was first published in the National Vulnerability Database on May 9, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-31973 actively exploited?

CVE-2023-31973 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-31973?

CVE-2023-31973 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2023-31973?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-31973, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-31973

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CVE-2023-31973

📅 Published

🔄 Last Modified

🔗 References (2)