{"id":"UBUNTU-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":"2026-10-28T17:43:53Z","published":"2026-10-23T21:17:00Z","upstream":["CVE-2026-83813"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-83813"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-83813"},{"type":"REPORT","url":"https://github.com/twisted/twisted/commit/b53e1c3477c209b5609a1c74cf9e48373b5879ac"},{"type":"REPORT","url":"https://github.com/twisted/twisted/pull/12700"},{"type":"REPORT","url":"https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1"},{"type":"REPORT","url":"https://github.com/twisted/twisted/security/advisories/GHSA-jj36-9pvh-vj5r"}],"affected":[{"package":{"name":"twisted","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/twisted?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["13.0.0-1ubuntu1","13.2.0-1ubuntu1","13.2.0-1ubuntu1.2","13.2.0-1ubuntu1.2+esm1","13.2.0-1ubuntu1.2+esm2","13.2.0-1ubuntu1.2+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"python-twisted","binary_version":"13.2.0-1ubuntu1.2+esm3"},{"binary_name":"python-twisted-bin","binary_version":"13.2.0-1ubuntu1.2+esm3"},{"binary_name":"python-twisted-conch","binary_version":"1:13.2.0-1ubuntu1.2+esm3"},{"binary_version":"13.2.0-1ubuntu1.2+esm3","binary_name":"python-twisted-core"},{"binary_name":"python-twisted-lore","binary_version":"13.2.0-1ubuntu1.2+esm3"},{"binary_name":"python-twisted-mail","binary_version":"13.2.0-1ubuntu1.2+esm3"},{"binary_name":"python-twisted-names","binary_version":"13.2.0-1ubuntu1.2+esm3"},{"binary_version":"13.2.0-1ubuntu1.2+esm3","binary_name":"python-twisted-news"},{"binary_version":"13.2.0-1ubuntu1.2+esm3","binary_name":"python-twisted-runner"},{"binary_version":"13.2.0-1ubuntu1.2+esm3","binary_name":"python-twisted-web"},{"binary_version":"13.2.0-1ubuntu1.2+esm3","binary_name":"python-twisted-words"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-83813.json"}},{"package":{"name":"twisted","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/twisted?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["15.2.1-1ubuntu2","15.5.0-1","15.5.0-2","15.5.0-2ubuntu1","15.5.0-4","16.0.0~pre1-1","16.0.0~pre1-1ubuntu1","16.0.0~pre1-2ubuntu1","16.0.0~pre1-3","16.0.0-1","16.0.0-1ubuntu0.2","16.0.0-1ubuntu0.4","16.0.0-1ubuntu0.4+esm1","16.0.0-1ubuntu0.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"16.0.0-1ubuntu0.4+esm2","binary_name":"python-twisted"},{"binary_name":"python-twisted-bin","binary_version":"16.0.0-1ubuntu0.4+esm2"},{"binary_name":"python-twisted-conch","binary_version":"1:16.0.0-1ubuntu0.4+esm2"},{"binary_version":"16.0.0-1ubuntu0.4+esm2","binary_name":"python-twisted-core"},{"binary_name":"python-twisted-mail","binary_version":"16.0.0-1ubuntu0.4+esm2"},{"binary_name":"python-twisted-names","binary_version":"16.0.0-1ubuntu0.4+esm2"},{"binary_name":"python-twisted-news","binary_version":"16.0.0-1ubuntu0.4+esm2"},{"binary_name":"python-twisted-runner","binary_version":"16.0.0-1ubuntu0.4+esm2"},{"binary_name":"python-twisted-web","binary_version":"16.0.0-1ubuntu0.4+esm2"},{"binary_version":"16.0.0-1ubuntu0.4+esm2","binary_name":"python-twisted-words"},{"binary_version":"16.0.0-1ubuntu0.4+esm2","binary_name":"python3-twisted"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-83813.json"}},{"package":{"name":"twisted","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/twisted?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.6.0-2ubuntu3","17.9.0-1","17.9.0-2","17.9.0-2ubuntu0.1","17.9.0-2ubuntu0.3","17.9.0-2ubuntu0.3+esm1","17.9.0-2ubuntu0.3+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"17.9.0-2ubuntu0.3+esm2","binary_name":"python-twisted"},{"binary_name":"python-twisted-bin","binary_version":"17.9.0-2ubuntu0.3+esm2"},{"binary_name":"python-twisted-conch","binary_version":"1:17.9.0-2ubuntu0.3+esm2"},{"binary_version":"17.9.0-2ubuntu0.3+esm2","binary_name":"python-twisted-core"},{"binary_name":"python-twisted-mail","binary_version":"17.9.0-2ubuntu0.3+esm2"},{"binary_name":"python-twisted-names","binary_version":"17.9.0-2ubuntu0.3+esm2"},{"binary_name":"python-twisted-news","binary_version":"17.9.0-2ubuntu0.3+esm2"},{"binary_version":"17.9.0-2ubuntu0.3+esm2","binary_name":"python-twisted-runner"},{"binary_name":"python-twisted-web","binary_version":"17.9.0-2ubuntu0.3+esm2"},{"binary_name":"python-twisted-words","binary_version":"17.9.0-2ubuntu0.3+esm2"},{"binary_name":"python3-twisted","binary_version":"17.9.0-2ubuntu0.3+esm2"},{"binary_name":"python3-twisted-bin","binary_version":"17.9.0-2ubuntu0.3+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2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