CVE catalog

CVE-2021-33452

NASM regression

[CVE catalog]

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

Severity: Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: May 19, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.33% · Oct 27, 2026

Projects and upstream resources

[nasm][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debiantrixie	nasm	`2.16.03-1`	Affected	[CVE-2021-33452]
Debiansid	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debiansid	nasm	`3.01-1`	Affected	[CVE-2021-33452]
Ubuntupro	nasm	`2.16.01-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Ubuntupro	nasm	`2.16.01-1build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Ubuntupro	nasm	`2.16.01-1ubuntu0.1~esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Ubuntupro	nasm	`2.16.01-1ubuntu0.1~esm2`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Debianforky	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debianforky	nasm	`3.01-1`	Affected	[CVE-2021-33452]
Debianbookworm	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debianbookworm	nasm	`2.16.01-1`	Affected	[CVE-2021-33452]

Showing 12 observations. All 16 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	nasm	Not reported	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	nasm	`2.16.01-1ubuntu0.1~esm1`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	nasm	`2.16.01-1ubuntu0.1~esm2`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debianbookworm	nasm	`2.16.01-1`	Affected	[CVE-2021-33452]
Debianforky	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debianforky	nasm	`3.01-1`	Affected	[CVE-2021-33452]
Debiansid	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debiansid	nasm	`3.01-1`	Affected	[CVE-2021-33452]
Debiantrixie	nasm	Not reported	AffectedDistribution reports no fix	[CVE-2021-33452]
Debiantrixie	nasm	`2.16.03-1`	Affected	[CVE-2021-33452]
Ubuntu25.10	nasm	`2.16.03-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Ubuntupro	nasm	`2.16.01-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Ubuntupro	nasm	`2.16.01-1build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Ubuntupro	nasm	`2.16.01-1ubuntu0.1~esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC
Ubuntupro	nasm	`2.16.01-1ubuntu0.1~esm2`	UnknownSource applicability is not established	[UBUNTU-CVE-2021-33452]May 11, 2026, 10:44:23 AM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "nasm",
      "status": "vulnerable",
      "release": "sid",
      "version": "3.01-1"
    },
    {
      "name": "nasm",
      "status": "vulnerable",
      "release": "forky",
      "version": "3.01-1"
    },
    {
      "name": "nasm",
      "status": "vulnerable",
      "release": "trixie",
      "version": "2.16.03-1"
    },
    {
      "name": "nasm",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "2.16.01-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "nasm",
      "fixed_version": "not yet fixed",
      "applicability_unknown": true
    },
    {
      "name": "nasm",
      "fixed_version": "2.16.01-1ubuntu0.1~esm2",
      "applicability_unknown": true
    },
    {
      "name": "nasm",
      "fixed_version": "2.16.01-1ubuntu0.1~esm1",
      "applicability_unknown": true
    },
    {
      "name": "nasm",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.16.01-1",
        "2.16.01-1build1",
        "2.16.01-1ubuntu0.1~esm1",
        "2.16.01-1ubuntu0.1~esm2"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-33452",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-33452",
      "provider_updated_at": "2026-05-11T10:44:23.060610842Z",
      "applicability_unknown": true
    },
    {
      "name": "nasm",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "2.16.03-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-33452",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-33452",
      "provider_updated_at": "2026-05-11T10:44:23.060610842Z",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[nasm]Unknown
Details (2)
- 2.16.01-1 · amd64 · bookworm
  Affected
  usn · nasm · debian · bookworm; usn · nasm · debian · 12
- 2.16.01-1 · arm64 · bookworm
  Affected
  usn · nasm · debian · bookworm; usn · nasm · debian · 12

[Debian 13 (Trixie)]

[nasm]Unknown
Details (2)
- 2.16.03-1 · amd64 · trixie
  Affected
  usn · nasm · debian · 13
- 2.16.03-1 · arm64 · trixie
  Affected
  usn · nasm · debian · 13

Observed: Oct 23, 2026, 5:57:48 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]