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CVE-2026-6238— Buffer overread in ns_printrrf with corrupted RDATA field

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及更新版本存在安全漏洞，该漏洞源于在处理DNS响应中的LOC、CERT、TKEY或TSIG记录时，函数ns_printrrf、ns_printrr和fp_nquery未能验证RDATA内容与RDATA长度，可能导致攻击者制作DNS响应，导致目标应用程序崩溃或读取未初始化内存。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
The GNU C Library glibc 2.0.1≤ 2.43 affected
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I. Basic Information for CVE-2026-6238

Vulnerability Information
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Vulnerability Title
Buffer overread in ns_printrrf with corrupted RDATA field
Source: CVE Program / CVE List V5
Vulnerability Description
The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory. These functions are for application debugging only and hence not in the path of code executed by the DNS resolver. Further, they have been deprecated since version 2.34 and should not be used by any new applications. Applications should consider porting away from these interfaces since they may be removed in future versions.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
Source: CVE Program / CVE List V5
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 2.2及更新版本存在安全漏洞，该漏洞源于在处理DNS响应中的LOC、CERT、TKEY或TSIG记录时，函数ns_printrrf、ns_printrr和fp_nquery未能验证RDATA内容与RDATA长度，可能导致攻击者制作DNS响应，导致目标应用程序崩溃或读取未初始化内存。
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 2.0.1 ~ 2.43 -

II. Public POCs for CVE-2026-6238

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III. Intelligence Information for CVE-2026-6238

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Mailing List Discussions for CVE-2026-6238 (1)

Other References for CVE-2026-6238 (1)

IV. Related Vulnerabilities

Same product: glibc
Same vendor: The GNU C Library
Same weakness: CWE-126

V. Comments for CVE-2026-6238

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