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CVE-2026-40469— Heap buffer overflow in gawk

Quick assessment

Affected
GNU gawk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNU gawk是美国GNU基金会开源的一种文本处理与模式扫描语言。 GNU gawk 5.4.0及之前版本存在数字错误漏洞，该漏洞源于“builtin.c”程序文件中do_sub()例程存在整数溢出，可能导致覆盖gawk堆元数据和对象，造成程序崩溃。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU gawk ≤ 5.4.0 affected
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I. Basic Information for CVE-2026-40469

Vulnerability Information
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Vulnerability Title
Heap buffer overflow in gawk
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
GNU gawk 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU gawk是美国GNU基金会开源的一种文本处理与模式扫描语言。 GNU gawk 5.4.0及之前版本存在数字错误漏洞，该漏洞源于“builtin.c”程序文件中do_sub()例程存在整数溢出，可能导致覆盖gawk堆元数据和对象，造成程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNU gawk 0 ~ 5.4.0 -

II. Public POCs for CVE-2026-40469

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III. Intelligence Information for CVE-2026-40469

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Patches & Fixes for CVE-2026-40469 (1)

Security Blog Posts for CVE-2026-40469 (1)

Same Patch Batch · GNU · 2026-07-13 · 5 CVEs total

CVE-2026-15520 5.3 MEDIUM GNU LibreDWG R2004 Section Decompression decode.c decompress_R2004_section heap-based over
CVE-2026-40553 Stack-based buffer overflow in gawk
CVE-2026-40468 Heap buffer overflow in gawk
CVE-2026-40467 Use after free in gawk

IV. Related Vulnerabilities

Same product: gawk
Same vendor: GNU
Same weakness: CWE-190

V. Comments for CVE-2026-40469

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