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CVE-2026-67201— V 0.5.2 SSRF Bypass via Parser Differential in net.urllib and net.http

Quick assessment

Affected

vlang v

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.

The V Programming Language The V Programming Language是The V Programming Language组织开源的一个编程语言。 The V Programming Language 0.5.2及之前版本存在处理逻辑错误漏洞，该漏洞源于net.urllib和net.http解析差异，可能导致服务端请求伪造绕过，攻击者可以绕过基于主机的白名单访问内部网络服务。

CVSS 8.6 · High EPSS 0.53% · P45 Updated Jul 30, 2026

Possible ATT&CK Techniques 2 AI

T1001 · Data Obfuscation T1557 · Adversary-in-the-Middle

Affected Version Matrix 2

Vendor	Product	Version Range	Status
vlang	v	`≤ 0.5.2`	affected
		`85859f0f3498d4091b38009c45ed390a97eeedc2`	unaffected

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I. Basic Information for CVE-2026-67201

Vulnerability Information

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Vulnerability Title

V 0.5.2 SSRF Bypass via Parser Differential in net.urllib and net.http

Source: CVE Program / CVE List V5

Vulnerability Description

V through 0.5.2, fixed in commit 85859f0, contains a server-side request forgery (SSRF) bypass vulnerability that allows attackers to circumvent host-based allowlists by exploiting a parser differential between net.urllib and net.http. Attackers can craft a URL containing a backslash in the authority section such that net.urllib.parse() extracts the trusted host for allowlist validation while net.http.get() normalizes the backslash and connects to the internal host, enabling access to internal network services that the allowlist was intended to block.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

解释冲突

Source: CVE Program / CVE List V5

Vulnerability Title

The V Programming Language 处理逻辑错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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
vlang	v	0 ~ 0.5.2	-

II. Public POCs for CVE-2026-67201

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-67201

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Patches & Fixes for CVE-2026-67201 (2)

Vendor Advisories for CVE-2026-67201 (1)

🔗 V 0.5.2 SSRF Bypass via Parser Differential in net.urllib and net.http | Advisories | VulnCheck third-party-advisory

Security Blog Posts for CVE-2026-67201 (1)

🔗 Security: SSRF in net.urllib due to backslash (\) parsing · Issue #27945 · vlang/v Read full article technical-description exploit

https://www.cve.org/CVERecord?id=CVE-2026-67201

IV. Related Vulnerabilities

Same weakness: CWE-436