Buffer overflow in Nasm
CVE-2026-6069
NASM’s disasm() function contains a stack based buffer overflow when formatting disassembly output, allowing an attacker triggered out-of-bounds write when `slen` exceeds the buffer capacity.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (37.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.6% 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: 0.005 · change: +0.000
Affected products
- Nasm — versions nasm-3.02rc5
- Nasm Netwide Assembler — versions 3.02
Weakness classification (CWE)
References
- github.com/netwide-assembler/nasm/issues/217 (Exploit, Issue Tracking)
Frequently asked questions
- What is CVE-2026-6069?
- CVE-2026-6069 is a high-severity vulnerability in Nasm, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-04-10.
- How severe is CVE-2026-6069?
- High severity. CVSS v3 base score is 7.5 out of 10.