Is there a public exploit for CVE-2026-128089?

No public exploit for CVE-2026-128089 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-128089?

CVE-2026-128089 scores CVSS 7.5 (v3.1), rated high.

What does CVE-2026-128089 affect?

CVE-2026-128089 affects dnspython.

7.5 High

dnspython has excessive memory and CPU use

CVE-2026-128089

Summary A maliciously crafted zone file could use a WKS record to consume excessive memory and CPU, possibly causing the process to exit due to memory exhaustion. Details The fromtext() parser does not check that a WKS record service number is between 0 and 65535 inclusive. It then uses this number to resize the bitmap to accommodate a bit with that offset. This can cause extremely large memory allocations, and also extends the array very inefficiently, wasting CPU. Proof of concept This demonstrates the failure to limit the service number, though with a value that does not cause excessive memory or CPU consumption. rd = dns.rdata.fromtext("IN", "WKS", "10.0.0.1 udp 65536") Impact If dnspython is used to read zonefile format where the attacker can control the type and rdata text, the program may consume excessive memory or CPU, denying service.

Assessment

CVSS: 7.5 (v3.1)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 November 2026
Last updated: 13 November 2026
Affected: dnspython
Weakness: CWE-400, CWE-770

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

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