SANS Stormcast Friday, January 9th, 2026: Gephi Analysis; zlib vuln; GnuPG Vulns; Cisco/Cloudflare DNS Issue
Update: 2026-01-09
Description
Analysis using Gephi with DShield Sensor Data
Gephi is a neat tool to create interactive data visualizations. It can be applied to honeypot data to find data clusters.
https://isc.sans.edu/diary/Analysis%20using%20Gephi%20with%20DShield%20Sensor%20Data/32608
zlib v1.3.1.2 Global Buffer Overflow in TGZfname() of zlib untgz Utility
The untgz utility that is part of zlib suffers from a straightforward buffer overflow in the filename parameter
https://seclists.org/fulldisclosure/2026/Jan/3
GnuPG Vulnerabilities
Several vulnerabilities in GnuPG were disclosed during a recent talk at the CCC congress.
https://gpg.fail
Cisco DNS Bug Reboot
Last night, several Cisco users reported that their switches rebooted. The issue appears to be related to a change Cloudflare made in the order of CNAME records. Only users using 1.1.1.1 as a recursive resolver appear to be affected.
https://community.cisco.com/t5/switches-small-business/got-fatal-error-cbs350-24t-4g/td-p/5359883?utm_source=chatgpt.com
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