7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-42304

CVE-2026-42304: Twisted: Denial of Service (DoS) in twisted.names via Crafted DNS Compression Pointer Chains

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.

(GitHub Advisory)

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CVE-2026-42304

CVE-2026-42304:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation pocAutomatable YesTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Twisted	pip	<= 25.5.0	26.4.0rc2

Technical Details

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Root Cause Analysis

The vulnerability lies in the twisted.names.dns.Name.decode function, which is responsible for decoding DNS names. The function does not limit the number of pointer dereferences, which allows an attacker to create a specially crafted DNS packet with a large number of pointers that refer to each other. When the decode function tries to resolve these pointers, it enters a long loop that consumes a large amount of CPU resources, leading to a Denial of Service. The DNSServerFactory.buildProtocol function is also involved in the vulnerability, as it is responsible for creating the protocol instance that handles the incoming DNS request. It does not validate the number of questions in the DNS message before passing it to the vulnerable Name.decode function. The fix for this vulnerability would be to add a limit to the number of pointer dereferences in the Name.decode function and to validate the number of questions in the DNSServerFactory.buildProtocol function.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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