Is there a public exploit for CVE-2026-48818?

No public exploit for CVE-2026-48818 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-48818?

CVE-2026-48818 scores CVSS 7.5 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.37%.

What does CVE-2026-48818 affect?

CVE-2026-48818 affects Kludex starlette.

7.5 High

Starlette is a lightweight ASGI framework/toolkit.

CVE-2026-48818

Summary When serving static files on Windows, StaticFiles resolves the requested path with [os.path.realpath](https://docs.python.org/3/library/os.path.html#os.path.realpath). If a UNC path (such as \\attacker.com\share) reaches the resolver, realpath causes the process to open a connection to the remote host over SMB (port 445). This is a server-side request forgery (SSRF) that leaks the service account's NTLMv2 credentials to the attacker-controlled host, which can then be cracked offline or relayed to other hosts. Details StaticFiles.lookuppath() joins the requested path onto the served directory and calls [os.path.realpath](https://docs.python.org/3/library/os.path.html#os.path.realpath) on the result before checking containment with [os.path.commonpath](https://docs.python.org/3/library/os.path.html#os.path.commonpath). On Windows, a UNC path is absolute, so [os.path.join](https://docs.python.org/3/library/os.path.html#os.path.join) discards the served directory and realpath resolves the bare UNC path, triggering the outbound SMB connection and NTLM authentication before the containment check rejects the path. The HTTP response is a benign 404, but the credential disclosure…

Assessment

CVSS: 7.5 (v3.1)
Severity: High
EPSS: 0.37% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 15 June 2026
Last updated: 26 October 2026
Affected: Kludex · starlette · starlette
Weakness: CWE-918
Assigner: security-advisories@github.com

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

At the source

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