CVE-2026-40468— 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"程序文件中存在整数溢出问题，可能导致宿主机内存耗尽，并可用攻击者控制的字节覆盖gawk堆元数据和对象。
Possible ATT&CK Techniques 3 AI
T1055 · Process Injection T1059 · Command and Scripting Interpreter T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-40468
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. This issue may lead to memory exhaustion on the hosting operating system and could be used to overwrite gawk heap metadata and objects with attacker-controlled bytes. It affects gawk in versions 5.4.0 and below.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L
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"程序文件中存在整数溢出问题，可能导致宿主机内存耗尽，并可用攻击者控制的字节覆盖gawk堆元数据和对象。
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
II. Public POCs for CVE-2026-40468
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-40468 (1)
Security Blog Posts for CVE-2026-40468 (1)
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🔗 Vulnerabilities in GNU gawk software | CERT Polska third-party-advisory
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-2026-40469 | Heap buffer overflow in gawk | |
| CVE-2026-40467 | Use after free in gawk |
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V. Comments for CVE-2026-40468
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