[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
dnspython	2.9.0 → 2.9.2

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dnspython has excessive memory and CPU use

CVE-2026-128089 / GHSA-vvf4-9x63-8xvv

More information

Details

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 from_text() 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.from_text("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.

Severity

• CVSS Score: 7.5 / 10 (High)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

• https://github.com/rthalley/dnspython/security/advisories/GHSA-vvf4-9x63-8xvv
• https://github.com/rthalley/dnspython/commit/388db14ee9923288f6e73f86e482c77706e59d73
• https://github.com/rthalley/dnspython/commit/a62e1be066da0ed71b5b59f37435bb17cfa0070f
• https://github.com/rthalley/dnspython/releases/tag/v2.9.2
• https://github.com/advisories/GHSA-vvf4-9x63-8xvv

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

rthalley/dnspython (dnspython)

v2.9.2: dnspython 2.9.2

Compare Source

A malicious WKS record in text format can consume excessive memory and CPU when parsed, possibly causing the process to exit due to memory exhaustion. Thanks to Jace (GitHub @​manus-use) for discovering and reporting this issue.

See What's New for details.

The minimum supported version of Python is 3.11.

My thanks to the many people who have contributed to this release. Also thanks to my co-maintainers: Nicki Křížek, Petr Špaček, and Brian Wellington.

This release was published to PyPI using Trusted Publishing.

v2.9.1: dnspython 2.9.1

Compare Source

See What's New for details.

The minimum supported version of Python is 3.11.

My thanks to the many people who have contributed to this release. Also thanks to my co-maintainers: Nicki Křížek, Petr Špaček, and Brian Wellington.

This release was published to PyPI using Trusted Publishing.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.31%. Comparing base (4701980) to head (ad0fd23).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1761   +/-   ##
=======================================
  Coverage   96.31%   96.31%           
=======================================
  Files          50       50           
  Lines        3831     3831           
=======================================
  Hits         3690     3690           
  Misses        141      141           

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