Buffer overflow in the error function in preproc.c for NASM 0.98.38 1.2 allows attackers to execute arbitrary code via a crafted asm file, a different vulnerability than CVE-2005-1194.

In NASM 2.15.04rc3, there is a double-free vulnerability in pptokline asm/preproc.c. This is fixed in commit 8806c3ca007b84accac21dd88b900fb03614ceb7.

NASM contains a heap use after free vulnerability in response file (-@) processing where a dangling pointer to freed memory is stored in the global dependfile and later dereferenced, as the response-file buffer is freed before the pointer is used, allowing for data corruption or remote code execution.

Buffer overflow in the listing module in Netwide Assembler (NASM) before 2.03.01 has unknown impact and attack vectors, a different vulnerability than CVE-2008-2719.

In Netwide Assembler (NASM) 2.14rc0, preproc.c allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted file.

Netwide Assembler (NASM) 2.14rc16 has a heap-based buffer over-read in expandmmacparams in asm/preproc.c for the special cases of the % and $ and ! characters.

Netwide Assembler (NASM) before 2.13.02 has a use-after-free in detoken at asm/preproc.c.

Netwide Assembler (NASM) 2.14rc15 has a heap-based buffer over-read in expandmmacparams in asm/preproc.c for insufficient input.

In Netwide Assembler (NASM) 2.14rc0, there are multiple heap use after free vulnerabilities in the tool nasm. The related heap is allocated in the token() function and freed in the detoken() function (called by ppgetline()) - it is used again at multiple positions later that could cause multiple damages. For example, it causes a corrupted double-linked list in detoken(), a double free or corruption in deleteToken(), and an out-of-bounds write in detoken(). It has a high possibility to lead to a remote code execution attack.

Netwide Assembler (NASM) 2.13.02rc2 has a stack-based buffer under-read in the function ieeeshr in asm/float.c via a large shift value.

Netwide Assembler (NASM) 2.13.02rc2 has a buffer over-read in the parseline function in asm/parser.c via uncontrolled access to nasmregflags.

In Netwide Assembler (NASM) 2.14.02, there is a use-after-free in pastetokens in asm/preproc.c.

Netwide Assembler (NASM) 2.13 has a stack-based buffer over-read in the disasm function of the disasm/disasm.c file. Remote attackers could leverage this vulnerability to cause a denial of service or possibly have unspecified other impact via a crafted ELF file.

NASM v2.16 was discovered to contain a heap buffer overflow in the component quoteforpmake() asm/nasm.c:856

There exists a heap buffer overflow in nasm 2.16.02rc1 (GitHub commit: b952891).

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.

A heap buffer overflow vulnerability exists in the Netwide Assembler (NASM) due to a lack of bounds checking in the objdirective() 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.

In Netwide Assembler (NASM) 2.14rc0, there is a heap-based buffer over-read that will cause a remote denial of service attack, related to a while loop in pastetokens in asm/preproc.c.

Last updated 25 August 2025

In Netwide Assembler (NASM) 2.15rc0, a heap-based buffer over-read occurs (via a crafted .asm file) in settextfree when called from expandonesmacro in asm/preproc.c.

Off-by-one error in the ppscan function (preproc.c) in Netwide Assembler (NASM) 2.02 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted file that triggers a stack-based buffer overflow.

NASM v2.16 was discovered to contain a global buffer overflow in the component dbgdbgtypevalue at /output/outdbg.c.

NASM nasm-2.13.03 nasm- 2.14rc15 version 2.14rc15 and earlier contains a memory corruption (crashed) of nasm when handling a crafted file due to function assemblefile(inname, dependptr) at asm/nasm.c:482. vulnerability in function assemblefile(inname, dependptr) at asm/nasm.c:482. that can result in aborting/crash nasm program. This attack appear to be exploitable via a specially crafted asm file..

Netwide Assembler (NASM) 2.14rc15 has a buffer over-read in x86/regflags.c.

In Netwide Assembler (NASM) 2.14rc0, there is an illegal address access in the function pastetokens() in preproc.c, aka a NULL pointer dereference. It will lead to remote denial of service.

A buffer over-read exists in the function crc64ib in crc64.c in nasmlib in Netwide Assembler (NASM) 2.14rc16. A crafted asm input can cause segmentation faults, leading to denial-of-service.

Netwide Assembler (NASM) through 2.14rc16 has memory leaks that may lead to DoS, related to nasmmalloc in nasmlib/malloc.c.

Netwide Assembler (NASM) 2.14rc15 has a NULL pointer dereference in the function findlabel in asm/labels.c that will lead to a DoS attack.

In Netwide Assembler (NASM) 2.14rc0, there is a use-after-free in ppverror in asm/preproc.c that will cause a remote denial of service attack.

In Netwide Assembler (NASM) 2.14rc0, there is a "SEGV on unknown address" that will cause a remote denial of service attack, because asm/preproc.c mishandles macro calls that have the wrong number of arguments.