CVE•Published 2026-05-13•Modified 2026-05-19•0 articles on news•6 live references•NVD data

CVE-2026-42304Twisted · Twisted

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

—

Weaknesses (CWE)

CWE-400Uncontrolled Resource Consumption CWE-407Inefficient Algorithmic Complexity

Description

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.

Timeline

Published 2026-05-13

Modified 2026-05-19

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-42304

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Twisted Twisted"

All exposed Twisted Twisted instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Twisted"

HTTP body or banner mentions "Twisted" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42304