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Vulnerability record · CVE-2020-24978 · published 4 September 2020

CVE-2020-24978: Nasm netwide assembler double free vulnerability

Nasm · Netwide Assembler

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

9.8 CVSS 3.1 Critical EPSS 1.4% · top 29.4% CWE-415 · Double free
9.8CVSS 3.1 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.nasm.us/show_bug.cgi?id=3392712 ExploitIssue TrackingVendor Advisory
https://bugzilla.nasm.us/show_bug.cgi?id=3392712 ExploitIssue TrackingVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2004-1287Nasm netwide assembler out-of-bounds write vulnerabilityBuffer overflow in the error function in preproc.c for NASM 0.98.38 1.2 allows attackers to execute arbitrary code via a crafted asm file, a differen…EPSS 18%9.6CVE-2026-6068Nasm netwide assembler use after free vulnerabilityNASM contains a heap use after free vulnerability in response file (-@) processing where a dangling pointer to freed memory is stored in the global d…EPSS 0.48%9.3CVE-2008-7177Nasm netwide assembler memory buffer overflow vulnerabilityBuffer overflow in the listing module in Netwide Assembler (NASM) before 2.03.01 has unknown impact and attack vectors, a different vulnerability tha…EPSS 2.4%7.8CVE-2023-31722Nasm netwide assembler out-of-bounds write vulnerabilityThere exists a heap buffer overflow in nasm 2.16.02rc1 (GitHub commit: b952891).EPSS 0.35%7.8CVE-2022-44370Nasm netwide assembler out-of-bounds write vulnerabilityNASM v2.16 was discovered to contain a heap buffer overflow in the component quote_for_pmake() asm/nasm.c:856EPSS 0.45%7.8CVE-2019-8343Nasm netwide assembler use after free vulnerabilityIn Netwide Assembler (NASM) 2.14.02, there is a use-after-free in paste_tokens in asm/preproc.c.EPSS 1.1%7.8CVE-2018-19214Nasm netwide assembler out-of-bounds read vulnerabilityNetwide Assembler (NASM) 2.14rc15 has a heap-based buffer over-read in expand_mmac_params in asm/preproc.c for insufficient input.EPSS 1.3%7.8CVE-2018-19215Nasm netwide assembler out-of-bounds read vulnerabilityNetwide Assembler (NASM) 2.14rc16 has a heap-based buffer over-read in expand_mmac_params in asm/preproc.c for the special cases of the % and $ and !…EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2020-24978), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.