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CVE-2026-25680— Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html

Quick assessment

Affected
golang.org/x/net golang.org/x/net/html
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是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于解析任意HTML可能消耗过多CPU时间，可能导致拒绝服务。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
golang.org/x/net golang.org/x/net/html < 0.55.0 affected
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I. Basic Information for CVE-2026-25680

Vulnerability Information
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Vulnerability Title
Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html
Source: CVE Program / CVE List V5
Vulnerability Description
Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于解析任意HTML可能消耗过多CPU时间，可能导致拒绝服务。
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
golang.org/x/net golang.org/x/net/html 0 ~ 0.55.0 -

II. Public POCs for CVE-2026-25680

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III. Intelligence Information for CVE-2026-25680

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Patches & Fixes for CVE-2026-25680 (1)

Vendor Advisories for CVE-2026-25680 (3)

Same Patch Batch · golang.org/x/net · 2026-05-22 · 5 CVEs total

CVE-2026-25681 Invoking incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/
CVE-2026-42502 Invoking incorrect handling of HTML elements in foreign content in golang.org/x/net/html
CVE-2026-42506 Invoking incorrect handling of namespaced elements in foreign content in golang.org/x/net
CVE-2026-27136 Invoking duplicate attributes can cause XSS in golang.org/x/net/html

IV. Related Vulnerabilities

Same product: golang.org/x/net/html
Same vendor: golang.org/x/net

V. Comments for CVE-2026-25680

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