How severe is CVE-2026-6067?

CVE-2026-6067 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-2026-6067 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6067?

CVE-2026-6067 affects Nasm Netwide Assembler. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6067?

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

Does CVE-2026-6067 have an EU (EUVD) identifier?

Yes. CVE-2026-6067 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21378.

When was CVE-2026-6067 published?

CVE-2026-6067 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-6067

CVE-2026-6067 is a medium-severity vulnerability in Nasm Netwide Assembler 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% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21378
Weakness: CWE-787
Affected product: Nasm Netwide Assembler
Published: 2026-04-10
Last modified: 2026-06-17

Description

A heap buffer overflow vulnerability exists in the Netwide Assembler (NASM) due to a lack of bounds checking in the obj_directive() function. This vulnerability can be exploited by a user assembling a malicious .asm file, potentially leading to heap memory corruption, denial of service (crash), and arbitrary code execution.

Frequently asked questions

What is CVE-2026-6067?: A heap buffer overflow vulnerability exists in the Netwide Assembler (NASM) due to a lack of bounds checking in the obj_directive() function. This vulnerability can be exploited by a user assembling a malicious .asm file, potentially leading to heap memory corruption, denial of service (crash), and arbitrary code execution.
How severe is CVE-2026-6067?: CVE-2026-6067 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-2026-6067 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6067?: CVE-2026-6067 affects Nasm Netwide Assembler. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6067?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6067 have an EU (EUVD) identifier?: Yes. CVE-2026-6067 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21378.
When was CVE-2026-6067 published?: CVE-2026-6067 was published on 2026-04-10 and last updated on 2026-06-17.

References

https://github.com/netwide-assembler/nasm/issues/203

Affected products (1)

cpe:2.3:a:nasm:netwide_assembler:3.02:rc5:*:*:*:*:*:*

More vulnerabilities in Nasm Netwide Assembler

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CVE-2023-31722 — High (CVSS 7.8): There exists a heap buffer overflow in nasm 2.16.02rc1 (GitHub commit: b952891).
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