CVE-2026-77584
published 2026-08-20CVE-2026-77584: 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…
PriorityP344high8.2CVSS 3.1
AVNACLPRNUINSUCNIHAL
EPSS
0.25%
15.4th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| torproject | tor | < 0.4.9.10 | 0.4.9.10 |
| torproject | tor | >= 0.4.8.1-alpha < 0.4.9.10 | 0.4.9.10 |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling [epel-all]
bugzilla·2026-08-22·CVSS 7.0
CVE-2026-77584 [HIGH] CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling [epel-all]
CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling [fedora-all]
bugzilla·2026-08-22·CVSS 7.0
CVE-2026-77584 [HIGH] CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling [fedora-all]
CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling
bugzilla·2026-08-20·CVSS 7.0
CVE-2026-77584 [HIGH] CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling
CVE-2026-77584 tor: Tor: Use-after-free vulnerability via CONFLUX_LINK cell handling
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.
2026-08-20
Published