CVE-2026-67201
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.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.6
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
- EPSS probability
- 0.39%
- CWE
- CWE-436
- Published
- 2026-07-29
- Last modified
- 2026-07-29
Affected products
- vlang v
- vlang v
Weakness type
Related vulnerabilities
- CVE-2026-87627 — Interpretation conflict in Safebrowsing in Google Chrome on on Mac prior to 153.0.8010.36 allowed a...
- CVE-2026-82537 — Roo-Code 3.54.0 Auto-Approve Bypass via Shell Parser Word-Boundary Mismatch
- CVE-2026-81378 — Visual Studio Code Security Feature Bypass Vulnerability
- CVE-2026-85184 — @fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target
- CVE-2026-84394 — fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority
- CVE-2026-63435 — Mail: Email address spoofing via malformed RFC 2047 encoded-words
- CVE-2026-75931 — fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references
- CVE-2026-57580 — authentik: Account Takeover via SAML NameID Comment Truncation