{"id":"CVE-2026-55248","summary":"plone.app.portlets: Denial of service via RSS feed portlet","details":"plone.app.portlets provides portlets and a Plone-specific user interface for plone.portlets. Prior to 5.0.8, 6.0.4, and 7.0.2, a member who can add an RSS portlet can set its feed URL to a very large response, causing src/plone/app/portlets/portlets/rss.py to download and retain excessive data in memory and deny service. The same RSS URL handling accepts internal hosts, IP addresses, single-word domains, and explicit ports, allowing server-side requests that can probe internal network services and open ports. A malicious feed item can also supply a JavaScript URL that is retained as the item link and can execute script when used by a victim. The affected logic includes _rss_feed_url_validator, _normal_url_validator, RSSFeed._retrieveFeed, RSSFeed._buildItemDict, and the FEED_DATA in-memory cache. This issue is fixed in versions 5.0.8, 6.0.4, and 7.0.2.","aliases":["GHSA-x5g3-w747-2h8q","PYSEC-2026-3884"],"modified":"2026-09-11T03:30:42.985360753Z","published":"2026-08-28T18:40:50.582Z","database_specific":{"cwe_ids":["CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55248.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55248.json"},{"type":"ADVISORY","url":"https://github.com/plone/plone.app.portlets/security/advisories/GHSA-x5g3-w747-2h8q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55248"},{"type":"FIX","url":"https://github.com/plone/plone.app.portlets/commit/09da52ef7b297daa8e0cfd2361e47c37d9b073ad"},{"type":"FIX","url":"https://github.com/plone/plone.app.portlets/commit/9f16b6fb10211916686c6c346ea174bf517e3fbd"},{"type":"FIX","url":"https://github.com/plone/plone.app.portlets/commit/a3b2c2887165b308cd915cbb87b8276f90a76680"},{"type":"FIX","url":"https://github.com/plone/plone.app.portlets/commit/df5e256baee55083cbd6b9a2623675d4cb26b6cd"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/plone/plone.app.portlets","events":[{"introduced":"0"},{"introduced":"285447dda504f8bbd6c06b34c5dff42df2cb857d"},{"introduced":"d8bbcbea3a278d4c34e5f8339c102b137733e6b9"},{"fixed":"7276bf16644ef7613d9b7c0166312cf6cd903bc1"},{"fixed":"452f243477dea33650dde251cc747628fd69e060"},{"fixed":"f4735a02b397652d8232d6e7f07a30845facfdcc"},{"fixed":"09da52ef7b297daa8e0cfd2361e47c37d9b073ad"},{"fixed":"9f16b6fb10211916686c6c346ea174bf517e3fbd"},{"fixed":"a3b2c2887165b308cd915cbb87b8276f90a76680"},{"fixed":"df5e256baee55083cbd6b9a2623675d4cb26b6cd"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"5.0.8"},{"introduced":"6.0.0"},{"fixed":"6.0.4"},{"introduced":"7.0.0"},{"fixed":"7.0.2"}]}}],"versions":["7.0.1","7.0.0","6.0.3","6.0.2","6.0.1","6.0.0","5.0.7","5.0.6","5.0.5","5.0.4","5.0.3","5.0.2","5.0.1","5.0.0","5.0.0b2","5.0.0b1","5.0.0a10","5.0.0a9","5.0.0a8","5.0.0a7","5.0.0a6","5.0.0a5","5.0.0a4","5.0.0a3","5.0.0a2","5.0.0a1","4.4.6","4.4.5","4.4.4","4.4.3","4.4.2","4.4.1","4.4.0","4.3.1","4.3.0","4.2.3","4.2.2","4.2.1","4.2","4.1.2","4.1.1","4.1.0","4.0.0","3.1.3","3.1.2","3.1.1","3.1","3.0.10","3.0.9","3.0.8","3.0.7","3.0.6","3.0.5","3.0.4","3.0.3","3.0.2","3.0.1","3.0","2.5.0","2.5a1","2.4.2","2.4.1","2.4.0","2.3.1","2.3","2.3a1","2.2.5","2.2.4","2.2.3","2.2.2","2.2.1","2.2","2.1.5","2.1.4","2.1.3","2.1.2","2.1.0","2.0.2","2.0.1","2.0","2.0b11","2.0b10","2.0b9","2.0b8","2.0b7","2.0b6","2.0b5","2.0b4","2.0b3","2.0b2","2.0b1","2.0a4","2.0a3","2.0a2","2.0a1","iteration1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55248.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H"}]}