SSRF and local file disclosure via unvalidated URLs

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Applications that pass attacker-controlled URLs to `webpage` versions before 2.1.0 may be vulnerable to server-side request forgery (SSRF) or local file disclosure. `HTTP::fetch` and `Webpage::from_url` passed URLs to libcurl without restricting the URL scheme or validating the resolved destination IP address. Redirects were followed without checking whether the new destination was internal. Depending on how the application uses the response, an attacker could: - Read local files accessible to the application process using `file://` URLs. - Cause requests to internal or link-local services (e.g. cloud metadata endpoints at `http://169.254.169.254`) via direct private-IP URLs or by chaining HTTP redirects through an attacker-controlled server. Starting in 2.1.0, `HTTP::fetch` and `Webpage::from_url` reject non-HTTP(S) URL schemes and destinations that resolve to non-public IP addresses, including after redirects. Applications that intentionally fetch trusted internal resources can opt in to the previous behavior with `HTTP::fetch_unrestricted` or `Webpage::from_url_unrestricted`. Reported by [Aiden Mohan](https://github.com/AidenMohan).

Source published

22 Oct 2026 12:00:00 UTC

Source modified

26 Oct 2026 14:00:04 UTC

Observed here

26 Oct 2026 14:35:44 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N