TI-2021-12859 Aliases CVE-2021-33450 GHSA-jp9m-h4rc-45p2

An issue was discovered in NASM version 2.16rc0.

LOW 25CWE-401Published 2022-07-26 · Updated 2024-08-03

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Will not fix Red Hat: no fix planned

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-401.

Summary

An issue was discovered in NASM version 2.16rc0. There are memory leaks in nasm_calloc() in nasmlib/alloc.c.

Why it matters now

EPSS 0.00328 26th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Will not fix Red Hat: no fix planned

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nasm:netwide_assembler:2.16:rc0::::::	2.16 rc0	Vulnerable	NASM

cpe:2.3:a:nasm:netwide_assembler:2.16:rc0:*:*:*:*:*:* Versions 2.16 rc0 Vulnerable ·NASM

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope

Timeline

2026-10-02 Threatist record created from CVE-2021-33450
2026-10-03 Alias added: GHSA-jp9m-h4rc-45p2

References

Exploit 1

https://bugzilla.nasm.us/show_bug.cgi?id=3392758

Advisory 1

https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d

TI-2026-05320 Use after free in NASM CVSS 3.1CRITICAL 9.6
TI-2026-05321 Out-of-bounds write in NASM CVSS 3.1HIGH 7.5
TI-2026-05319 Out-of-bounds write in NASM CVSS 3.1HIGH 7.5
TI-2004-01165 Buffer overflow in the error function in preproc.c for NASM 0.98.38 1.2 allows attackers… CVSS 2.0HIGH 10.0
TI-2023-20017 Stack-based buffer over-read in disasm in nasm 2.16 allows attackers to cause a denial of service (crash). CVSS 3.1MEDIUM 5.5
TI-2023-20016 Stack-based buffer over-read in function disasm in nasm 2.16 allows attackers to cause a denial of service. CVSS 3.1MEDIUM 5.5

See all 74 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences