CVE-2026-5435— Potential buffer overflow in ns_sprintrrf TSIG handling path
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I. Basic Information for CVE-2026-5435
Vulnerability Information
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Vulnerability Title
Potential buffer overflow in ns_sprintrrf TSIG handling path
Source: NVD (National Vulnerability Database)
Vulnerability Description
The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)
Vulnerability Title
GNU C Library 缓冲区错误漏洞
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 2.2及更新版本存在缓冲区错误漏洞，该漏洞源于ns_printrrf、ns_printrr和fp_nquery函数未能强制执行调用者提供的缓冲区长度，可能导致越界写入。
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 | 2.2 ~ * | - |
II. Public POCs for CVE-2026-5435
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://nvd.nist.gov/vuln/detail/CVE-2026-5435
IV. Related Vulnerabilities
Same product: glibc
- CVE-2026-6238
Buffer overread in ns_printrrf with corrupted RDATA field - CVE-2026-5450
scanf %mc off-by-one heap buffer overflow - 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-2026-5450
scanf %mc off-by-one heap buffer overflow - 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
V. Comments for CVE-2026-5435
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