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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NASM | NASM | nasm-3.02rc5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nasm | No fix yet | — |
| Debian 13 | nasm | No fix yet | — |
| Debian 12 | nasm | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nasm | No fix yet | — |
| Ubuntu 26.04 LTS | nasm | No fix yet | — |
| Ubuntu 25.10 | nasm | No fix yet | — |
| Ubuntu 20.04 LTS | nasm | No fix yet | — |
| Ubuntu 18.04 LTS | nasm | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | nasm | No fix yet | — |
| Ubuntu Pro 24.04 LTS | nasm | No fix yet | — |
| Ubuntu Pro 22.04 LTS | nasm | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | nasm | 2.16.03-150700.3.3.1 | SUSE-SU-2026:3178-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | nasm | 3.02-1.1 | openSUSE-SU-2026:11217-1 |
| openSUSE Leap 16.0 | nasm | 3.02-160000.1.1 | openSUSE-SU-2026:21333-1 |
Advisories 3
- SUSE-SU-2026:3178-1 Security update for nasm SUSE / openSUSE Security Updates · Jul 23, 2026
- openSUSE-SU-2026:21333-1 Security update for nasm SUSE / openSUSE Security Updates · Jul 15, 2026
- openSUSE-SU-2026:11217-1 nasm-3.02-1.1 on GA media SUSE / openSUSE Security Updates · Jul 9, 2026