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CVE-2026-56392— Heap-based Buffer Overflow in GNU coreutils

Quick assessment

Affected
GNU coreutils
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 coreutils是美国GNU基金会开源的一套基础系统命令行工具集。 GNU coreutils 9.11及之前版本存在缓冲区错误漏洞，该漏洞源于在处理大型制表位（-t）值时缓冲分配过程中存在整数溢出，导致缓冲区大小不足，在处理特制输入时后续写入操作超出分配的内存，可能触发崩溃并根据内存布局实现堆写入原语。

CVSS 1.8 · Low EPSS 0.19% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU coreutils ≤ 9.11 affected
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I. Basic Information for CVE-2026-56392

Vulnerability Information
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Vulnerability Title
Heap-based Buffer Overflow in GNU coreutils
Source: CVE Program / CVE List V5
Vulnerability Description
GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write. When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout. This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
GNU coreutils 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU coreutils是美国GNU基金会开源的一套基础系统命令行工具集。 GNU coreutils 9.11及之前版本存在缓冲区错误漏洞，该漏洞源于在处理大型制表位（-t）值时缓冲分配过程中存在整数溢出，导致缓冲区大小不足，在处理特制输入时后续写入操作超出分配的内存，可能触发崩溃并根据内存布局实现堆写入原语。
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 coreutils 0 ~ 9.11 -

II. Public POCs for CVE-2026-56392

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III. Intelligence Information for CVE-2026-56392

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Patches & Fixes for CVE-2026-56392 (2)

Security Blog Posts for CVE-2026-56392 (1)

IV. Related Vulnerabilities

Same product: coreutils
Same vendor: GNU
Same weakness: CWE-122

V. Comments for CVE-2026-56392

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