ReleasesConfirmed
Tor 0.4.9.15 security release adds DoS defenses and drops 0.4.8 support
Published · Updated
The Tor Project released version 0.4.9.15, a security update introducing new defenses against large volumes of directory requests. The release makes the HSDir flag sticky across restarts and updates directory authorities to require specific protocol capabilities, rendering Tor versions 0.4.8 and earlier incompatible with the network. Operators are advised to upgrade relays as soon as possible.
Why it matters
The release includes critical DoS mitigations for relays and enforces protocol changes that will disconnect older clients from the network.
Event status Released
Read the sources
- tor-0.4.9.15 gitlab.torproject.org
- Release of tor 0.4.9.15 and the deployment of a new protocol version at directory authorities. The protocol change causes some clients to repeatedly re-request consensus documents, making them appear gitlab.torproject.org
- [tor-announce] [RELEASE] New C-tor 0.4.9.15 lists.torproject.org
This is an AI-assisted summary of the linked public sources. Consult the original reports for details and operator guidance.