CVE-2026-128089
dnspython excessive memory and CPU use
dnspython is a DNS toolkit for Python. Prior to version 2.9.2, the from_text() parser for WKS records does not require the service number to be between 0 and 65535 before using it as a bitmap offset. An attacker-controlled zone file can supply a larger number, causing the service bitmap to grow to an extremely large size through inefficient repeated extension, consuming excessive memory and CPU and potentially terminating the process. Applications are affected only when they parse zone-file text whose record type and rdata are attacker controlled. This issue is fixed in version 2.9.2.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| dnspython rthalley |
< 2.9.2 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/rthalley/dnspython/security/advisories/GHSA-vvf4-9x63-8xvvCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/rthalley/dnspython/commit/388db14ee9923288f6e73f86e482c77706e59d73CNA: GitHub_M · x_refsource_MISC
- https://github.com/rthalley/dnspython/commit/a62e1be066da0ed71b5b59f37435bb17cfa0070fCNA: GitHub_M · x_refsource_MISC
- https://github.com/rthalley/dnspython/releases/tag/v2.9.2CNA: GitHub_M · x_refsource_MISC
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