CVE-2026-42499— Quadratic string concatenation in consumePhrase in net/mail
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I. Basic Information for CVE-2026-42499
Vulnerability Information
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Vulnerability Title
Quadratic string concatenation in consumePhrase in net/mail
Source: NVD (National Vulnerability Database)
Vulnerability Description
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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RFC 5322电子邮件地址时，病态输入可能导致通过consumePhrase造成拒绝服务。
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 |
|---|---|---|---|---|
| Go standard library | net/mail | 0 ~ 1.25.10 | - |
II. Public POCs for CVE-2026-42499
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|---|
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Same Patch Batch · Go standard library · 2026-05-07 · 7 CVEs total
| CVE-2026-39836 | Panic in Dial and LookupPort when handling NUL byte on Windows in net | |
| CVE-2026-39826 | Escaper bypass leads to XSS in html/template | |
| CVE-2026-39825 | ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/http | |
| CVE-2026-39823 | Bypass of meta content URL escaping causes XSS in html/template | |
| CVE-2026-39820 | Quadratic string concatentation in consumeComment in net/mail | |
| CVE-2026-33811 | Crash when handling long CNAME response in net |
IV. Related Vulnerabilities
Same vendor: Go standard library
- CVE-2026-39820
Quadratic string concatentation in consumeComment in net/mai - CVE-2026-39823
Bypass of meta content URL escaping causes XSS in html/templ - CVE-2026-39826
Escaper bypass leads to XSS in html/template - CVE-2026-33811
Crash when handling long CNAME response in net - CVE-2026-39836
Panic in Dial and LookupPort when handling NUL byte on Windo
V. Comments for CVE-2026-42499
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