CVE-2026-40469Heap buffer overflow in gawk

Integer overflow vulnerability has been found in "builtin.c" program file of gawk (do_sub() routine). This issue could be used to overwrite gawk heap metadata and objects causing the program to crash. It affects 32-bit builds of gawk in versions 5.4.0 and below.

5.1 MEDIUMEPSS 0.21%Not in KEVNVD: Analyzed

Last updated: 2026-10-24 22:10 UTC

OverviewCVSS details

5.1MEDIUMCVSS 4.0

Score source: CERT-PL (CNA)
NVD status: Analyzed
Published: Jul 13, 2026
Assigner: CERT-PL

Affected

gawk (GNU)

Versions: through 5.4.0

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —
SSVC: Exploitation none · Automatable no · Impact partial

EPSS · FIRST, scored Nov 7

0.21%chance of exploitation in 30 days

Higher than 11.71% of CVEs

CVSS 4.0 · CERT-PL (CNA)

5.1Medium

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Attack vector: Local
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: None
Confidentiality impact: None
Integrity impact: None
Availability impact: Low
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · NVD

9.1Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
5.1	MEDIUM	4.0CERT-PL (CNA)	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
9.1	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Details

CVE ID: CVE-2026-40469
Status: Analyzed
Assigner (CNA): CERT-PL
Published: Jul 13, 2026
Last modified: 2026-10-24 22:10 UTC
Weaknesses: CWE-190 · Integer Overflow or Wraparound

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:30 UTC.