CVE-2026-40468— Heap buffer overflow in gawk
Possible ATT&CK Techniques 3AI
T1055 · Process Injection T1059 · Command and Scripting Interpreter T1203 · Exploitation for Client ExecutionGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-40468
Vulnerability Information
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Vulnerability Title
Heap buffer overflow in gawk
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
Source: NVD (National Vulnerability Database)
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
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Patches & Fixes for CVE-2026-40468 (1)
Security Blog Posts for CVE-2026-40468 (1)
- 🔗 Vulnerabilities in GNU gawk software | CERT Polskathird-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 |
IV. Related Vulnerabilities
Same weakness: CWE-190
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Possible integer overflow on 32-bit systems when reading GIF - CVE-2026-33327
Possible integer overflow leading to potential heap-based bu - CVE-2026-63091
ProFTPD mod_sftp Signed Integer Overflow via SCP Size-Record
V. Comments for CVE-2026-40468
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