SANS Stormcast Friday, January 9th, 2026: Gephi Analysis; zlib vuln; GnuPG Vulns; Cisco/Cloudflare DNS Issue (#)

SANS Stormcast Friday, January 9th, 2026: Gephi Analysis; zlib vuln; GnuPG Vulns; Cisco/Cloudflare DNS Issue (#)

Author: Johannes B. Ullrich January 9, 2026 Duration: 7:12
SANS Stormcast Friday, January 9th, 2026: Gephi Analysis; zlib vuln; GnuPG Vulns; Cisco/Cloudflare DNS Issue 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 keywords: gephi; dshield; honeypot; zlib; untgz; gnupg; ccc; cisco; cloudflare; dns

Each weekday morning, Johannes B. Ullrich provides a concise, actionable briefing on the shifting landscape of digital threats and defenses with SANS Internet Storm Center's Daily Network Security News Podcast. Think of it as your first cup of coffee for cybersecurity awareness-a focused, five-minute update that cuts through the noise. The content is shaped by real-time data and analysis from the SANS Internet Storm Center, enriched by questions and experiences shared directly from the community of professionals in the field. You’ll hear about emerging vulnerabilities, active exploits, and practical insights that are both late-breaking and genuinely educational, all delivered in a straightforward, no-frills manner. This podcast serves as a reliable filter, turning the overwhelming flow of security news into a clear, digestible summary that helps you understand current risks and start your day informed. It’s built on a foundation of shared knowledge, where listener contributions actively guide the discussion, making each episode a collaborative reflection of what matters right now in network security.
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