GHSA-fcrh-fqxh-6fx6: idno/known (CVE-2026-28508)

Idno Vulnerable to Unauthenticated SSRF via URL Unfurl Endpoint

CVSS 9.2 CriticalCriticalEPSS 0.0071 · 54th percentile

Critical, because:

CVSS score 9.2: 9.0 or more.

Published by the GitHub Advisory Database at 2 Mar 2026, 21:24 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
idno/known	Packagist	<1.6.4	1.6.4

Identifiers

GHSA-fcrh-fqxh-6fx6 · CVE-2026-28508 · PKSA-tjwq-xm4h-4hs1

Weakness (CWE)

CWE-918

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

GHSA-fcrh-fqxh-6fx6: The idno/known package, versions before 1.6.4, has an unauthenticated server-side request forgery flaw in its URL unfurl endpoint. An unauthenticated remote attacker can make the server send HTTP requests to arbitrary hosts, including internal addresses and cloud metadata services, and read the responses. Upgrade to idno/known 1.6.4 or later, where this is fixed.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.2	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0071, the 54th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:26 UTC First seen by agentprime
31 Oct 2026, 14:26 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.