CVE-2026-67201 Details
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.
A server-side request forgery (SSRF) bypass vulnerability has been identified in V language versions through 0.5.2. This vulnerability allows attackers to circumvent host-based allowlists by exploiting a parsing discrepancy between the net.urllib and net.http libraries. By crafting a URL with a backslash in the authority section, attackers can manipulate the parsing behavior to bypass allowlist checks and access internal network services that should be blocked.
Users can update to V language version 0.5.3 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 29, 2026CISA-ADP
Assessed Jul 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/vlang/v/commit/85859f0f3498d4091b38009c45ed390a97eeedc2 | [email protected] | Source CodeVendor |
| https://github.com/vlang/v/issues/27945 | [email protected] | Issue TrackingTechnical DescriptionVendor |
| https://github.com/vlang/v/pull/27947 | [email protected] | Source CodeVendor |
| https://www.vulncheck.com/advisories/v-ssrf-bypass-via-parser-differential-in-net-urllib-and-net-http | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-436 | Interpretation Conflict | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| V | <= 0.5.2 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 29, 2026 | CVE Modified | CISA-ADP |
| Jul 29, 2026 | New CVE Received | [email protected] |