CVE-2026-40469 PUBLISHED

Heap buffer overflow in gawk

Assigner: CERT-PL
Reserved: 13.04.2026 Published: 13.07.2026 Updated: 13.07.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	GNU
Product	gawk
Versions	Default: unaffected affected from 0 to 5.4.0 (incl.)

CVE-2026-40469 PUBLISHED

Heap buffer overflow in gawk

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Product Status

Credits

References

Problem Types