Vulnerability details
CVE-2026-77584
torproject Tor
CVSS 3.1
7.0High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.0High | 3.1 | CVEProject cvelistV5 (CNA) (mitre) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| torproject | Tor | 0.4.8.1-alpha ≤ v < 0.4.9.10 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-08-21
- Last updated
- 2026-08-25
- State
- Published
- Assigner (CNA)
- mitre
Exploit prediction (EPSS)
0.25%
Probability of exploitation in 30 days
16.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-821Incorrect Synchronization