How severe is CVE-2023-30402?

CVE-2023-30402 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-30402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-30402?

CVE-2023-30402 affects Yasm Project Yasm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-30402?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-30402 published?

CVE-2023-30402 was published on 2023-04-25 and last updated on 2026-06-17.

CVE-2023-30402

CVE-2023-30402 is a medium-severity vulnerability in Yasm Project Yasm with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Yasm Project Yasm
Published: 2023-04-25
Last modified: 2026-06-17

Description

YASM v1.3.0 was discovered to contain a heap overflow via the function handle_dot_label at /nasm/nasm-token.re. Note: This has been disputed by third parties who argue this is a bug and not a security issue because yasm is a standalone program not designed to run untrusted code.

Frequently asked questions

What is CVE-2023-30402?: YASM v1.3.0 was discovered to contain a heap overflow via the function handle_dot_label at /nasm/nasm-token.re. Note: This has been disputed by third parties who argue this is a bug and not a security issue because yasm is a standalone program not designed to run untrusted code.
How severe is CVE-2023-30402?: CVE-2023-30402 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-30402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-30402?: CVE-2023-30402 affects Yasm Project Yasm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-30402?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-30402 published?: CVE-2023-30402 was published on 2023-04-25 and last updated on 2026-06-17.

References

https://github.com/yasm/yasm/issues/206

Affected products (1)

cpe:2.3:a:yasm_project:yasm:1.3.0:*:*:*:*:*:*:*

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