CVE-2026-67201 V 0.5.2 SSRF Bypass via Parser Differential in net.urllib and net.http
Attackers can bypass host allowlists in the V language standard library to access internal network services via parser differential SSRF.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67201?
CVE-2026-67201 is a high-severity server-side request forgery vulnerability in vlang v, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-436
Which versions are affected by CVE-2026-67201?
Linux distribution packages (1)
vlang openSUSE:Tumbleweed | All versions | 0.5.2-2.1 |
How do I fix CVE-2026-67201?
Apply the vendor's patch.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-67201 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67201 exists.
Sources
Also known as GHSA-mvrj-5wv7-cfg9, openSUSE-SU-2026:11480-1.