Bug 2457289 (CVE-2026-6067)

Summary: CVE-2026-6067 nasm: Netwide Assembler (NASM): Arbitrary code execution via malicious assembly file processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Netwide Assembler (NASM). This heap buffer overflow vulnerability, stemming from insufficient bounds checking, allows a user to execute arbitrary code by assembling a specially crafted malicious assembly (.asm) file. Successful exploitation can lead to unauthorized command execution, heap memory corruption, and denial of service, potentially causing system instability or crashes.
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Bug Depends On: 2458087, 2458089    
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Description OSIDB Bzimport 2026-04-10 14:01:34 UTC 
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.
Comment 3 Dominik 'Rathann' Mierzejewski 2026-04-22 20:55:10 UTC 
CVSS score at NVD is wrong, should be 5.5 medium. (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)