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

Quick assessment

Affected
twisted twisted
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Twisted 是一个面向互联网应用的事件驱动框架，支持 Python 3.6 及以上版本。在版本 26.10.0rc1 之前， 在接收 UDP DNS 响应时，仅校验 16 位事务 ID 是否与待处理查询匹配，却未验证该响应是否确实来自被查询的主机和端口。因此，任何能够向解析器监听端口发送携带正确事务 ID 数据包的攻击者，均可注入伪造的响应。标准的 会为每次查询使用新的随机源端口，从而增加了非路径攻击（off-path attack）的复杂度；然而，若应用程序复用同一个 实例，则在首次查询后，攻击面将仅限于事务

CVSS 3.1 · Low
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I. Basic Information for CVE-2026-83813

Vulnerability Information
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Vulnerability Title
Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address Validation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
twisted twisted < 26.7.0rc1 -

II. Public POCs for CVE-2026-83813

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III. Intelligence Information for CVE-2026-83813

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Patches & Fixes for CVE-2026-83813 (1)

Vendor Advisories for CVE-2026-83813 (1)

Vendor Pages for CVE-2026-83813 (1)

Same Patch Batch · twisted · 2026-10-23 · 6 CVEs total

CVE-2026-115775 8.7 HIGH Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element
CVE-2026-115776 7.5 HIGH Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbound
CVE-2026-115778 7.5 HIGH Twisted: Unauthenticated Remote Denial of Service in the Twisted conch Telnet Transport vi
CVE-2026-115877 5.4 MEDIUM Twisted: HTTP Request Smuggling in twisted.web via a Bare CR or LF in a Header Value
CVE-2026-115774 4.9 MEDIUM Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEAR

IV. Related Vulnerabilities

Same product: twisted
Same vendor: twisted
Same weakness: CWE-346

V. Comments for CVE-2026-83813

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