CVE-2026-5435— Potential buffer overflow in ns_sprintrrf TSIG handling path
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。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| The GNU C Library | glibc | 2.2≤ * |
affected |
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
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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Mailing List Discussions for CVE-2026-5435 (1)
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Other References for CVE-2026-5435 (1)
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IV. Related Vulnerabilities
Same product: glibc
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Same vendor: The GNU C Library
-
CVE-2026-97399
One-byte overread in strncasecmp on Power8 -
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AT_SECURE program buffer overflow via $ORIGIN processing -
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AT_SECURE programs may load attacker-controlled code via $OR -
CVE-2026-8674
Assertion failure in the DNS stub resolver with a long searc -
CVE-2026-80489
EUC_JISX0213 decoding may hang on crafted input
Same weakness: CWE-787
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V. Comments for CVE-2026-5435
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