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    CVE-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 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.

    Published:Aug 20, 2026
    Last Modified:Aug 25, 2026
    EPS:Aug 20, 2026
    EPSS Score:0.00176
    CVSS Score:7

    Affected Products

    Vendor
    Torproject
    Product
    Tor

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-821 Incorrect Synchronization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-77639 (CVSS 5.3) — Tor before 0.4.9.9 was prone to a compression bomb bypass where an attacker could concatenate many gzip or zli…
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    CVE-2026-77587 (CVSS 5.9) — Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recove…
    CVE-2026-44603 (CVSS 3.7) — Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.…
    CVE-2026-44602 (CVSS 3.7) — Tor before 0.4.9.7 has a NULL pointer dereference when a CERT cell is received out of order, aka TROVE-2026-00…
    CVE-2026-44601 (CVSS 3.7) — Tor before 0.4.9.7, when circuit queue memory pressure exists, can experience a client crash because of a doub…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High