CVE-2023-31723

MEDIUMNVD 5.55.5—

5.5

yasm 1.3.0.55.g101bc was discovered to contain a segmentation violation via the function expand_mmac_params at /nasm/nasm-pp.c.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 20.6%
KEV: Not listed

Published

May 17, 2023

Last Modified

January 22, 2025

References (4)

cve@mitrehttps://github.com/DaisyPo/fuzzing-vulncollect/blob/main/yasm/SEGV/nasm-pp.c:4008%20in%20expand_mmac_params/README.md
cve@mitrehttps://github.com/yasm/yasm/issues/220
af854a3a-2127-422b-91ae-364da2661108https://github.com/DaisyPo/fuzzing-vulncollect/blob/main/yasm/SEGV/nasm-pp.c:4008%20in%20expand_mmac_params/README.md
af854a3a-2127-422b-91ae-364da2661108https://github.com/yasm/yasm/issues/220

Data Freshness Timeline

(refreshed 14× in last 7d / 57× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-23 21:31 UTCEPSS rescore
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2026-06-10 07:47 UTCOSV refresh
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2026-05-31 22:29 UTCEPSS rescore
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2026-05-26 07:18 UTCEPSS rescore
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2026-05-26 07:17 UTCEPSS rescore
2026-05-25 00:57 UTCEG score recompute
2026-05-25 00:57 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-31723?

CVE-2023-31723 is a medium vulnerability published on May 17, 2023. yasm 1.3.0.55.g101bc was discovered to contain a segmentation violation via the function expandmmacparams at /nasm/nasm-pp.c.

When was CVE-2023-31723 disclosed?

CVE-2023-31723 was first published in the National Vulnerability Database on May 17, 2023, with the most recent update on January 22, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-31723 actively exploited?

CVE-2023-31723 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-31723?

CVE-2023-31723 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2023-31723?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-31723, 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

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CVE-2023-31723

📅 Published

🔄 Last Modified

🔗 References (4)