CVE-2018-20538
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2...
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
- Record
CVE-2018-20538- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Weakness
- CWE-416
- Updated
- 2026-11-02
CVE List No score
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
- Record
CVE-2018-20538- Updated
- 2026-11-02
EUVDEUVD-2018-13092 No score
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
- Record
EUVD-2018-13092- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vvh8-8r3j-wmjw
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2...
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
- Record
GHSA-vvh8-8r3j-wmjw- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
OSV
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
- Record
CVE-2018-20538- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2018-20538
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
- Record
DEBIAN-CVE-2018-20538- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-20538
There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during certain finishes tests.
- Record
UBUNTU-CVE-2018-20538- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
nasmDebian:12 |
All versions, plus listed versions 2.16.01-12.16.03-13.01-1 |
None known |
nasmDebian:13 |
All versions, plus listed versions 2.16.03-13.01-1 |
None known |
nasmDebian:14 |
All versions, plus listed versions 2.16.03-13.01-1 |
None known |
nasmUbuntu:16.04:LTS |
All versions, plus listed versions 2.11.06-1really2.11.05-12.11.08-12.11.08-1ubuntu0.1 |
None known |
nasmUbuntu:18.04:LTS |
All versions, plus listed versions 2.13.01-22.13.02-0.1 |
None known |
nasmUbuntu:20.04:LTS |
All versions, plus listed versions 2.14.02-1 |
None known |
nasmUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 2.15.05-12.15.05-1ubuntu0.1~esm12.15.05-1ubuntu0.1~esm2 |
None known |
nasmUbuntu:Pro:24.04:LTS |
All versions, plus listed versions 2.16.01-12.16.01-1build12.16.01-1ubuntu0.1~esm12.16.01-1ubuntu0.1~esm2 |
None known |
nasmUbuntu:25.10 |
All versions, plus listed versions 2.16.03-1 |
None known |
nasmUbuntu:26.10 |
All versions, plus listed versions 3.01-1 |
None known |
nasmUbuntu:26.04:LTS |
All versions, plus listed versions 2.16.03-13.01-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-20538 is a medium vulnerability (CVSS 5.5) in Nasm Netwide Assembler, published December 28, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.79%, the 56th percentile. No source names a fixed version.