zeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0047, the 40th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:01 UTC First seen by agentprime
2. 31 Oct 2026, 15:01 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-qc2x-6f54-m6h9
• OSV: GHSA-qc2x-6f54-m6h9
• github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-qc2x-6f54-m6h9
• github.com/python-zeroconf/python-zeroconf/issues/1752
• github.com/python-zeroconf/python-zeroconf/pull/1756
• github.com/python-zeroconf/python-zeroconf

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.