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CVE-2026-115776— Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line Buffer

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 26.10.0rc1 之前， 方法会将所有未包含换行符的接收字节保留在每条连接各自的缓冲区中，且未对单行长度设置上限。 服务器子类继承了该行为，且该缓冲发生在 、 或 等认证命令之前。因此，未认证的连接可不断增大缓冲区，直至共享的服务器进程耗尽内存，导致所有用户被断开。该问题已在版本 26.10.0rc1 中修复。

CVSS 7.5 · High EPSS 0.74% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-115776

Vulnerability Information
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Vulnerability Title
Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line Buffer
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.words.protocols.irc.IRC.dataReceived retains all bytes received without a line feed in its per-connection buffer and applies no maximum line length. The twisted.words.service.IRCUser server subclass inherits this behavior, and buffering occurs before PASS, NICK, or USER authentication commands. An unauthenticated connection can continuously grow the buffer until the shared server process runs out of memory and drops all users. This issue is fixed in version 26.10.0rc1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
twisted twisted < 26.10.0rc1 -

II. Public POCs for CVE-2026-115776

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III. Intelligence Information for CVE-2026-115776

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Patches & Fixes for CVE-2026-115776 (3)

Vendor Advisories for CVE-2026-115776 (1)

Vendor Pages for CVE-2026-115776 (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-2026-115778 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
CVE-2026-83813 3.1 LOW Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address Validation

IV. Related Vulnerabilities

Same product: twisted
Same vendor: twisted
Same weakness: CWE-400

V. Comments for CVE-2026-115776

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