{"id":"CVE-2026-83813","title":"Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address Validation","summary":"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 d…","severity":"low","cvss":3.1,"cvssVector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-346"],"vendor":"twisted","product":"twisted","affected":["twisted < 26.7.0rc1"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-29T18:15:10.606448Z"},"exploitAvailable":true,"published":"2026-10-23","updated":"2026-10-29","sourceUpdated":"2026-10-29T18:15:36.711Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-83813","references":[{"url":"https://github.com/twisted/twisted/security/advisories/GHSA-jj36-9pvh-vj5r","label":"https://github.com/twisted/twisted/security/advisories/GHSA-jj36-9pvh-vj5r"},{"url":"https://github.com/twisted/twisted/pull/12700","label":"https://github.com/twisted/twisted/pull/12700"},{"url":"https://github.com/twisted/twisted/commit/b53e1c3477c209b5609a1c74cf9e48373b5879ac","label":"https://github.com/twisted/twisted/commit/b53e1c3477c209b5609a1c74cf9e48373b5879ac"},{"url":"https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1","label":"https://github.com/twisted/twisted/releases/tag/twisted-26.10.0rc1"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83813"},{"url":"https://github.com/twisted/twisted"},{"url":"https://github.com/advisories/GHSA-jj36-9pvh-vj5r"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83813.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-83813"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2560186"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-83813"}],"tags":["cve.org","exploit-available","osv","pip","ghsa","csaf","vex","red-hat"],"epss":0.00114,"epssPercentile":0.01494,"aliases":["GHSA-jj36-9pvh-vj5r"],"ecosystem":"pip","patched":["twisted 26.10.0rc1"],"scores":{"cna":3.1,"osv":3.1,"ghsa":3.1,"vendor":3.7},"ingestedAt":"2026-10-23T21:38:13.061Z","slug":"CVE-2026-83813","body":"## Overview\n\nTwisted 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.\n\n## Affected\n\n- `twisted < 26.7.0rc1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-83813)\n\nAffected packages:\n\n- `twisted < 26.10.0rc1`\n\nPatched in:\n\n- `twisted 26.10.0rc1`\n\nSource: https://osv.dev/vulnerability/GHSA-jj36-9pvh-vj5r\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Ansible Automation Platform 2, Red Hat OpenStack Platform 16.2 · no fix planned: Red Hat Ansible Automation Platform 2, Red Hat OpenStack Platform 16.2 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83813.json)","depth":"twilight","depthScore":29,"depthScoreParts":{"impact":17.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":231979,"id":"CVE-2026-83813","ts":1793574264760,"field":"exploit_available","old":"false","new":"true"},{"seq":229844,"id":"CVE-2026-83813","ts":1793117559818,"field":"cvss","old":"3.7","new":"3.1"},{"seq":228635,"id":"CVE-2026-83813","ts":1792844825870,"field":"cvss","old":"3.1","new":"3.7"}]}