RCS 4.0: video calls and E2EE in chats https://sudonull.com/rcs-4-0-video-calls-and-e2ee-in-chats
Learn about RCS Universal Profile 4.0: built-in video calls, text formatting, media optimization and end-to-end encryption. For Android/iOS developers — detailed breakdown of features and API.
RCE in Marimo CVE-2026-39987: exploit in 9 hours https://sudonull.com/rce-in-marimo-cve-2026-39987-exploit-in-9-hours
Critical pre-auth RCE in Marimo up to 0.23.0 gives root-shell via WebSocket. Sysdig: attack 9 hours after advisory. Update, rotate secrets, protect AI toolchain. Detailed analysis and measures.
RCE in MCPJam Inspector: HTB Kobold walkthrough https://sudonull.com/rce-in-mcpjam-inspector-htb-kobold-walkthrough
Full HTB Kobold walkthrough: RCE via MCPJam v1.4.2, Docker LFI, credential reuse to root. For devsecops — code, commands, GHSA-232v-j27c-5pp6 vulnerabilities.
RCA cables: test $7 vs $4000 no difference https://sudonull.com/rca-cables-test-7-vs-4000-no-difference
Audio Precision measurements: premium Kimber KS 1136 no better than Amazon Basic in noise, distortions, jitter. Facts for audio engineers. Get to know the tests
E2EE RCS in iOS 26.5: beta testing https://sudonull.com/e2ee-rcs-in-ios-26-5-beta-testing
End-to-end encryption RCS in iOS 26.5 available in beta by default. Activation details, limitations and RCS Universal Profile 4.0. Test for cross-platform security — read the analysis.