CVE catalog

CVE-2020-24978

nasm: CVE-2020-24978

Severity: Medium
Published: Sep 4, 2020, 12:15:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.36% · Oct 25, 2026

In NASM 2.15.04rc3, there is a double-free vulnerability in pp_tokline asm/preproc.c. This is fixed in commit 8806c3ca007b84accac21dd88b900fb03614ceb7.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	nasm	sid	`3.01-1`	fixed
Debian	nasm	forky	`3.01-1`	fixed
Debian	nasm	trixie	`2.16.03-1`	fixed
Debian	nasm	bookworm	`2.16.01-1`	fixed
Ubuntu	nasm	16.04	`2.11.06-1really2.11.05-1`	vulnerable
Ubuntu	nasm	16.04	`2.11.08-1`	vulnerable
Ubuntu	nasm	16.04	`2.11.08-1ubuntu0.1`	vulnerable
Ubuntu	nasm	18.04	`2.13.01-2`	vulnerable
Ubuntu	nasm	18.04	`2.13.02-0.1`	vulnerable
Ubuntu	nasm	20.04	`2.14.02-1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	nasm	source	sid	`2.15.04-1`	not yet assigned	Not reported	Not reported
Debian	nasm	source	forky	`2.15.04-1`	not yet assigned	Not reported	Not reported
Debian	nasm	source	trixie	`2.15.04-1`	not yet assigned	Not reported	Not reported
Debian	nasm	source	bookworm	`2.15.04-1`	not yet assigned	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[nasm]Fixed
Details (2)
- 2.16.01-1 · amd64 · bookworm
  Fixed · Fixed: 2.15.04-1
  dsa · nasm · debian · bookworm; dsa · nasm · debian · 12
- 2.16.01-1 · arm64 · bookworm
  Fixed · Fixed: 2.15.04-1
  dsa · nasm · debian · bookworm; dsa · nasm · debian · 12

[Debian 13 (Trixie)]

[nasm]Fixed
Details (2)
- 2.16.03-1 · amd64 · trixie
  Fixed · Fixed: 2.15.04-1
  dsa · nasm · debian · 13
- 2.16.03-1 · arm64 · trixie
  Fixed · Fixed: 2.15.04-1
  dsa · nasm · debian · 13

Observed: Oct 23, 2026, 5:49:21 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]