Detections
Analytics
CVE-2026-128089
high
Description
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.
References
https://github.com/rthalley/dnspython/security/advisories/GHSA-vvf4-9x63-8xvv
https://github.com/rthalley/dnspython/releases/tag/v2.9.2
https://github.com/rthalley/dnspython/commit/a62e1be066da0ed71b5b59f37435bb17cfa0070f
https://github.com/rthalley/dnspython/commit/388db14ee9923288f6e73f86e482c77706e59d73