CVE-2026-5450— scanf %mc off-by-one heap buffer overflow
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I. Basic Information for CVE-2026-5450
Vulnerability Information
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Vulnerability Title
scanf %mc off-by-one heap buffer overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
GNU C Library 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU C Library是GNU社区的一种按照LGPL许可协议发布的开源免费的C语言编译程序。 GNU C Library 2.7至2.43版本存在安全漏洞，该漏洞源于使用%mc和宽度大于1024的格式说明符调用scanf系列函数，可能导致单字节堆缓冲区溢出。
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 | 2.7 ~ * | - |
II. Public POCs for CVE-2026-5450
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IV. Related Vulnerabilities
Same product: glibc
- CVE-2026-6238
Buffer overread in ns_printrrf with corrupted RDATA field - CVE-2026-5435
Potential buffer overflow in ns_sprintrrf TSIG handling path - CVE-2026-5928
Potential buffer under-read in ungetwc - CVE-2026-4046
iconv crash due to assertion failure with untrusted input - CVE-2026-4438
gethostbyaddr and gethostbyaddr_r return invalid DNS hostnam
Same vendor: The GNU C Library
- CVE-2026-6238
Buffer overread in ns_printrrf with corrupted RDATA field - CVE-2026-5435
Potential buffer overflow in ns_sprintrrf TSIG handling path - CVE-2026-5928
Potential buffer under-read in ungetwc - CVE-2026-4046
iconv crash due to assertion failure with untrusted input - CVE-2026-4438
gethostbyaddr and gethostbyaddr_r return invalid DNS hostnam
Same weakness: CWE-122
- CVE-2026-45130
Vim: Heap Buffer Overflow in spell file loading - CVE-2026-8087
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V. Comments for CVE-2026-5450
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