{"id":"CVE-2026-104817","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-104817","generatedAt":"2026-10-28T02:24:20.741Z","title":"An attacker can trigger unbounded outbound HTTP requests and synchronous parsing, exhausting instance resources, amplifying requests toward third-party servers, or probing network-reachable services even when federation is disabled.","description":"Misskey is an open source, federated social media platform. From 12.112.1 until 2026.7.0, the unauthenticated fetch-rss API lacks rate limiting and response-size restrictions and performs synchronous XML parsing. An attacker can trigger unbounded outbound HTTP requests and synchronous parsing, exhausting instance resources, amplifying requests toward third-party servers, or probing network-reachable services even when federation is disabled. This issue is fixed in version 2026.7.0.","published":"2026-10-13T19:17:56.000Z","lastModified":"2026-10-16T20:04:30.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":8.7,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:L/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-405","CWE-770","CWE-918"],"affected":[],"epss":{"score":0.0046,"percentile":0.39574,"date":"2026-10-26","history":[{"date":"2026-10-14","score":0.0046,"percentile":0.38252}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-13T19:17:56.000Z","detail":{"score":"8.7","severity":"HIGH","publishedAt":"2026-10-13T19:17:55.697Z"},"summary":"New CVE, high severity (CVSS 8.7)."}],"references":[{"url":"https://github.com/misskey-dev/misskey/commit/a12ee2e5d72c40252e11a164b2231667c9697667","source":"security-advisories@github.com"},{"url":"https://github.com/misskey-dev/misskey/releases/tag/2026.7.0","source":"security-advisories@github.com"},{"url":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-4x7v-qx8f-g3p8","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-104817","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}