CVE-2026-115776 Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line Buffer
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115776?
CVE-2026-115776 is a high-severity vulnerability in twisted, published on 23 Oct 2026.
Official 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.
Which versions are affected by CVE-2026-115776?
2 open source packages ship an affected version, including Twisted and twisted.
| Package | Affected | Fixed in |
|---|---|---|
Twisted PyPI | All versions | 26.10.0rc1 |
twisted PyPI | All versions | 26.10.0rc1 |
How do I fix CVE-2026-115776?
Upgrade Twisted to 26.10.0rc1 or later.
Is CVE-2026-115776 being exploited?
There is no known exploitation of CVE-2026-115776 in the wild and no public exploit code.
Sources
Also known as AZL-111410, DEBIAN-CVE-2026-115776, ECHO-988d-d5ce-c91c, GHSA-53xc-49m8-p798, UBUNTU-CVE-2026-115776.