{"id":"DEBIAN-CVE-2026-83813","details":"Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.names.dns.DNSDatagramProtocol accepts a UDP DNS response for a pending query when its 16-bit transaction ID matches but does not verify that the response came from the queried host and port. An attacker able to deliver a packet to the resolver's listening port with the correct transaction ID can inject a forged answer. The standard twisted.names.client.Resolver uses a new random source port for each query, increasing off-path attack complexity, while applications that reuse a DNSDatagramProtocol instance expose only the transaction-ID search space after the first query. A successful forgery can redirect hostname resolution and enable mail interception, server-side request forgery, or man-in-the-middle positioning. This issue is fixed in version 26.10.0rc1.","modified":"2026-10-24T11:00:12.059384534Z","published":"2026-10-23T21:17:25.287Z","upstream":["CVE-2026-83813"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-83813"}],"affected":[{"package":{"name":"twisted","ecosystem":"Debian:12","purl":"pkg:deb/debian/twisted?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.4.0-4","22.4.0-4+deb12u1","23.10.0-1","23.10.0-2","24.10.0-1","24.10.0-2","24.11.0-1","24.3.0-1","24.3.0-2","24.3.0-3","24.7.0-1","24.7.0-2","24.7.0-3","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4","26.4.0-5","26.4.0-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-83813.json"}},{"package":{"name":"twisted","ecosystem":"Debian:13","purl":"pkg:deb/debian/twisted?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["24.11.0-1","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4","26.4.0-5","26.4.0-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-83813.json"}},{"package":{"name":"twisted","ecosystem":"Debian:14","purl":"pkg:deb/debian/twisted?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["24.11.0-1","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4","26.4.0-5","26.4.0-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-83813.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}