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CVE-2026-40553— Stack-based 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及之前版本存在缓冲区错误漏洞，该漏洞源于extension/readdir.c程序文件中的ftype()例程存在缓冲区溢出，可能导致程序崩溃并可能实现代码执行。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.46% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU gawk ≤ 5.4.0 affected
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I. Basic Information for CVE-2026-40553

Vulnerability Information
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Vulnerability Title
Stack-based buffer overflow in gawk
Source: CVE Program / CVE List V5
Vulnerability Description
Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. 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:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
GNU gawk 缓冲区错误漏洞
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及之前版本存在缓冲区错误漏洞，该漏洞源于extension/readdir.c程序文件中的ftype()例程存在缓冲区溢出，可能导致程序崩溃并可能实现代码执行。
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-2026-40553

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III. Intelligence Information for CVE-2026-40553

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Patches & Fixes for CVE-2026-40553 (1)

Security Blog Posts for CVE-2026-40553 (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-2026-40468 Heap buffer overflow in gawk
CVE-2026-40469 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-121

V. Comments for CVE-2026-40553

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