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CVE-2026-18374

Quick assessment

Affected
The GNU C Library glibc
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 C Library是美国GNU基金会的一个实现C语言标准库功能的运行库。 GNU C Library 2.45及之前版本存在缓冲区错误漏洞，该漏洞源于向 函数的mode参数中的 语法扩展传递有效空字符串，可能导致堆缓冲区溢出。

CVSS 4.9 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
The GNU C Library glibc < 2.45 affected
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I. Basic Information for CVE-2026-18374

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled. This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
GNU C Library 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU C Library是美国GNU基金会的一个实现C语言标准库功能的运行库。 GNU C Library 2.45及之前版本存在缓冲区错误漏洞，该漏洞源于向`fopen`函数的mode参数中的`,ccs=`语法扩展传递有效空字符串，可能导致堆缓冲区溢出。
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
The GNU C Library glibc 0 ~ 2.45 -

II. Public POCs for CVE-2026-18374

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III. Intelligence Information for CVE-2026-18374

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Vendor Advisories for CVE-2026-18374 (1)

Other References for CVE-2026-18374 (1)

IV. Related Vulnerabilities

Same product: glibc
Same vendor: The GNU C Library

V. Comments for CVE-2026-18374

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