Description
asm/labels.c in Netwide Assembler (NASM) is prone to NULL Pointer Dereference, which allows the attacker to cause a denial of service via a crafted file.
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 | 2.14-1 | — |
| Debian 13 | nasm | 2.14-1 | — |
| Debian 12 | nasm | 2.14-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | 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 | — |
| Ubuntu 16.04 LTS | nasm | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 SP2 | nasm | 2.14.02-3.4.1 | SUSE-SU-2020:1843-1 |
| SLES 15 SP1 | nasm | 2.14.02-3.4.1 | SUSE-SU-2020:1843-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.2 | nasm | 2.14.02-lp152.4.3.1 | openSUSE-SU-2020:0954-1 |
| openSUSE Leap 15.1 | nasm | 2.14.02-lp151.3.3.1 | openSUSE-SU-2020:0952-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Netwide Assembler (NASM) 2.14rc15 - NULL Pointer Dereference (PoC) EDB-46726 · dos · Apr 18, 2019
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- openSUSE-SU-2020:0954-1 Security update for nasm SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1843-1 Security update for nasm SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0952-1 Security update for nasm SUSE / openSUSE Security Updates · Feb 4, 2026