Sam James <[email protected]> writes:

> Here's the relevant release notes at the link in the email below:
> """
> Changes in version 0.4.9.12 - 2026-09-08
>   Another security release containing several high security fixes reported by
>   the exciting and controversial world of LLMs. One important note is that new
>   protocol versions are recommended for clients and relays (41316).
>   Furthermore, authorities will NOT accept relay descriptor containing TAP 
> keys
>   anymore hence the importance for all relays to upgrade to the latest 0.4.9.x
>   stable version. We very strongly recommend upgrading as soon as possible.

These bugs are public now. They're accessible at
https://gitlab.torproject.org/tpo/core/tor/-/work_items/XXXX.

>
>   o Major bugfixes (security):
> [...]
>
>     - Fix a bug where a hostile cache could trick a client into falsely
>       believing that certain relays' microdescriptors or router
>       descriptors were unusable. Fixes bug 41358; bugfix on 0.2.6.1-alpha
>       or earlier. Tracked as TROVE-2026-034.

From a quick look, this appears to be the most significant one, as a
malicious guard can influence circuit building to relays of its
choosing, without the tampering being detected by tor.

> [....]

sam

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