CVE-2026-77584
High
Description
Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the same circuit, attaching an exit stream that would later end up orphan leaving a dangling circuit back-pointer and a use-after-free (UAF) when the circuit is freed. This is TROVE-2026-025.
SeverityHigh
CVSS7.0
Exploit probability—
ProductTor
PublishedAug 20, 2026
First seenAug 20, 2026
Weakness typeCWE-821CWE-821
How to fix
Update
- torproject tor0.4.9.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| torproject tor | v < 0.4.9.10 | 0.4.9.10 |
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