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CVE-2026-46600— Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage

Quick assessment

Affected
Go standard library net
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.

Google Go是美国Google公司开源的一种静态强类型、编译型、并发型,并具有垃圾回收功能的编程语言。 Google Go存在缓冲区错误漏洞，该漏洞源于解析无效的SVCB或HTTPS资源记录时参数值大小溢出消息缓冲区，可能导致内核崩溃。

AI Predicted 7.5 Difficulty: Easy EPSS 0.63% · P48

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 3

VendorProduct Version RangeStatus
Go standard library net 1.26.0-0< 1.26.6 affected
1.27.0-0< 1.27.0-rc.3 affected
golang.org/x/net golang.org/x/net/dns/dnsmessage < 0.56.0 affected
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I. Basic Information for CVE-2026-46600

Vulnerability Information
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Vulnerability Title
Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage
Source: CVE Program / CVE List V5
Vulnerability Description
Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国Google公司开源的一种静态强类型、编译型、并发型,并具有垃圾回收功能的编程语言。 Google Go存在缓冲区错误漏洞，该漏洞源于解析无效的SVCB或HTTPS资源记录时参数值大小溢出消息缓冲区，可能导致内核崩溃。
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
Go standard library net 1.26.0-0 ~ 1.26.6 -
golang.org/x/net golang.org/x/net/dns/dnsmessage 0 ~ 0.56.0 -

II. Public POCs for CVE-2026-46600

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III. Intelligence Information for CVE-2026-46600

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Patches & Fixes for CVE-2026-46600 (1)

Vendor Advisories for CVE-2026-46600 (2)

Proof of Concept for CVE-2026-46600 (1)

IV. Related Vulnerabilities

Same product: net
Same vendor: Go standard library

V. Comments for CVE-2026-46600

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