CVE-2026-83813

CVE-2026-83813 · Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address Validation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 3.1 · Low

Published

2026-10-23T20:21:54.364Z

Updated

2026-10-23T20:21:54.364Z

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