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Fencer Vulns
high 7.5

CVE-2026-6067 json

CVE-2026-6067

published 2026-04-10 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-21378

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

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.

Patch / fix

  • nasm SLE Module for Development Tools 15 SP7 2.16.03-150700.3.3.1

suse advisories SUSE-SU-2026:3178-1

  • nasm openSUSE Leap 16.0 3.02-160000.1.1
  • nasm openSUSE Tumbleweed 3.02-1.1

opensuse advisories openSUSE-SU-2026:21333-1openSUSE-SU-2026:11217-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-6067 updated cvss 7.3

nasm: Netwide Assembler (NASM): Arbitrary code execution via malicious assembly file processing

  • Red Hat Enterprise Linux 6 nasm, nasm-rdoff
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 nasm, nasm-rdoff Red Hat Enterprise Linux 8 nasm Red Hat Enterprise Linux 9 nasm Red Hat Enterprise Linux 10 nasm
    not affected: vulnerable code cannot be controlled by adversary

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/netwide-assembler/nasm/issues/203 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • NASM NASM

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.