SecurityHigh priorityReported
Reported sustained circuit-building DoS wave on Tor network since June 2026
Published · Updated
A relay operator reports a sustained circuit-building DoS against their guard relay family starting June 25, 2026, characterized by an 8x sustained increase in open circuits and a 20x peak. The attack involved millions of near-idle circuits and onionskin processing spikes across multiple regions, with bandwidth increasing only 20%. While DoS defenses engaged and prevented TCP port exhaustion, EU relays shed 10-20% of real traffic due to capacity constraints.
Why it matters
The report suggests the pattern is network-wide or family-targeted, and notes that EU relays shed 10-20% of real traffic.
Event status Developing
Read the sources
This is an AI-assisted summary of the linked public sources. Consult the original reports for details and operator guidance.