# CVE-2026-115776: Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.words.protocols.irc.IRC.

Source: https://junglewise.ai/threats/cve-2026-115776-twisted-unauthenticated-remote-denial-of-service-in-the-twisted  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-23. Updated: 2026-10-23  
License: CC BY 4.0 with a link back

CVE-2026-115776 · Severity: high · CVSS 7.5 · Published 2026-10-23

Twisted is a networking framework that includes an IRC server implementation. An unauthenticated attacker can send a specially crafted message without line breaks to exhaust the server's memory, crashing the service and disconnecting all users. This affects any IRC server built on Twisted's words module.

Technologies: [twisted (PyPI)](https://junglewise.ai/threats/technologies/pypi-twisted), [Twisted](https://junglewise.ai/threats/technologies/twisted-twisted). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi), [Twisted](https://junglewise.ai/threats/vendors/twisted).

## Quick answers

**Is CVE-2026-115776 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115776 being exploited in the wild.

**How severe is CVE-2026-115776?** High severity, with a CVSS score of 7.5, published 23 October 2026.

**Which products and versions are affected?** twisted (PyPI) <= 26.4.0, ECOSYSTEM:introduced=0,fixed=26.10.0rc1; Twisted 26.4.0 and earlier.

**Is there a fix for CVE-2026-115776?** Yes. twisted (PyPI): upgrade to 26.10.0rc1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-115776 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-115776?** Check whether you run twisted (PyPI) or Twisted at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- twisted (PyPI): upgrade to 26.10.0rc1 or later

  ```sh
  pip install "twisted>=26.10.0rc1"
  ```


## Technical details

An unbounded-buffer vulnerability (CWE-770) in twisted.words.protocols.irc.IRC.dataReceived appends every received byte to a per-connection buffer without enforcing a maximum length or timeout, removing data only at line feed characters. An unauthenticated remote attacker can exhaust server memory by sending data without line feeds, causing the single-threaded process to out-of-memory and crash, dropping all connections. The vulnerability exists before any authentication checks.

## Affected products

- Twisted Twisted 26.4.0 and earlier

## Identifiers

- CVE-2026-115776
- GHSA-53xc-49m8-p798

## Timeline

- 2026-10-23: disclosed

## Related threats

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- [Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address Validation](https://junglewise.ai/threats/cve-2026-83813-twisted-is-an-event-based-framework-for-internet-applications)
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- [Twisted conch telnet unbounded subnegotiation buffer denial of service](https://junglewise.ai/threats/cve-2026-115778-twisted-unauthenticated-remote-denial-of-service-in-the-twisted)
- [Twisted unbounded element tree denial of service](https://junglewise.ai/threats/cve-2026-115775-twisted-unauthenticated-remote-denial-of-service-in-the-twisted)