Vulnerability index

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Tor CRITICAL 9.1
CVE-2026-44603

Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.

Fix: 0.4.9.7+
Fix from $2,300 2026-05-07
Tor HIGH 7.5
CVE-2026-44601

Tor before 0.4.9.7, when circuit queue memory pressure exists, can experience a client crash because of a double close of a circuit, aka TROVE-2026-0…

Fix: 0.4.9.7+
Fix from $1,950 2026-05-07
Tor HIGH 7.5
CVE-2026-44602

Tor before 0.4.9.7 has a NULL pointer dereference when a CERT cell is received out of order, aka TROVE-2026-006.

Fix: 0.4.9.7+
Fix from $1,950 2026-05-07
Tor MEDIUM 5.3
CVE-2026-44600

Tor before 0.4.9.7 mishandles accounting of the conflux out-of-order queue during the clearing of a queue, aka TROVE-2026-010.

Fix: 0.4.9.7+
Fix from $1,600 2026-05-07
Tor MEDIUM 5.3
CVE-2026-44599

Tor before 0.4.9.7 can attempt or accept BEGIN_DIR via conflux legs, aka TROVE-2026-008.

Fix: 0.4.9.7+
Fix from $1,600 2026-05-07
Tor CRITICAL 9.1
CVE-2026-44597

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Fix: 0.4.9.7+
Fix from $2,300 2026-05-07
Tor HIGH 7.5
CVE-2022-33903

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Fix: 0.4.7.8+
Fix from $1,950 2022-07-17
Tor MEDIUM 5.5
CVE-2021-46702

Tor Browser 9.0.7 on Windows 10 build 10586 is vulnerable to information disclosure. This could allow local attackers to bypass the intended anonymit…

Mitigation only
Fix from $1,600 2022-02-26
Tor Browser MEDIUM 6.1
CVE-2021-39246

Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact…

Fix: after 10.5.6
Fix from $1,600 2021-09-24
Tor HIGH 7.5
CVE-2021-38385

Tor before 0.3.5.16, 0.4.5.10, and 0.4.6.7 mishandles the relationship between batch-signature verification and single-signature verification, leadin…

Fix: 0.3.5.16 / 0.4.5.10+
Fix from $1,950 2021-08-30
Tor HIGH 7.5
CVE-2021-34549

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an atta…

Fix: 0.3.5.15 / 0.4.4.9+
Fix from $1,950 2021-06-29
Tor HIGH 7.5
CVE-2021-34550

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-006. The v3 onion service descriptor parsing allows out-of-bounds memory access, and a …

Fix: 0.3.5.15 / 0.4.4.9+
Fix from $1,950 2021-06-29
Tor HIGH 7.5
CVE-2021-34548

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-003. An attacker can forge RELAY_END or RELAY_RESOLVED to bypass the intended access co…

Fix: 0.3.5.15 / 0.4.4.9+
Fix from $1,950 2021-06-29
Tor HIGH 7.5
CVE-2020-15572

Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozill…

Fix: 0.3.5.11 / 0.4.2.8+
Fix from $1,950 2020-07-15
Tor HIGH 7.5
CVE-2020-10593

Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (memory leak), aka TROVE-2…

Fix: 0.3.5.10 / 0.4.1.9+
Fix from $1,950 2020-03-23
Tor HIGH 7.5
CVE-2020-10592

Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (CPU consumption), aka TRO…

Fix: 0.3.5.10 / 0.4.1.9+
Fix from $1,950 2020-03-23
Tor MEDIUM 5.3
CVE-2020-8516

The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, whi…

Fix: after 0.4.2.6
Fix from $1,600 2020-02-02
Tor HIGH 7.5
CVE-2015-2688

buf_pullup in Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle unexpected arrival times of buffers with invalid layouts, whic…

Fix: 0.2.4.26 / 0.2.5.11+
Fix from $1,950 2020-01-24
Tor HIGH 7.5
CVE-2015-2689

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which all…

Fix: 0.2.4.26 / 0.2.5.11+
Fix from $1,950 2020-01-24
Tor HIGH 7.5
CVE-2015-2928

The Hidden Service (HS) server implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote attackers to …

Fix: 0.2.4.27 / 0.2.5.12+
Fix from $1,950 2020-01-24
Tor HIGH 7.5
CVE-2015-2929

The Hidden Service (HS) client implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote servers to ca…

Fix: 0.2.4.27 / 0.2.5.12+
Fix from $1,950 2020-01-24
Tor Browser MEDIUM 5.3
CVE-2019-13075

Tor Browser through 8.5.3 has an information exposure vulnerability. It allows remote attackers to detect the browser's language via vectors involvin…

Fix: after 8.5.3
Fix from $1,600 2019-06-30
Tor HIGH 7.5
CVE-2019-8955

In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients…

Fix: 0.3.3.12 / 0.3.4.11+
Fix from $1,950 2019-02-21
Tor HIGH 7.5
CVE-2018-0491EPSS 15%

A use-after-free issue was discovered in Tor 0.3.2.x before 0.3.2.10. It allows remote attackers to cause a denial of service (relay crash) because t…

Fix: 0.3.2.10+
Fix from $1,950 2018-03-05
Tor MEDIUM 5.9
CVE-2017-0380

The rend_service_intro_established function in or/rendservice.c in Tor before 0.2.8.15, 0.2.9.x before 0.2.9.12, 0.3.0.x before 0.3.0.11, 0.3.1.x bef…

Fix: after 0.2.8.14
Fix from $1,600 2017-09-18
Tor HIGH 7.5
CVE-2017-0377

Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote a…

Patch available
Fix from $1,950 2017-07-02
Tor HIGH 7.5
CVE-2017-0375

The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the relay_send_end_cell_from_edge_…

Fix: 0.3.0.8+
Fix from $1,950 2017-06-09
Tor HIGH 7.5
CVE-2016-8860

Tor before 0.2.8.9 and 0.2.9.x before 0.2.9.4-alpha had internal functions that were entitled to expect that buf_t data had NUL termination, but the …

Fix: after 0.2.8.8
Fix from $1,950 2017-01-04
Tor MEDIUM 5.8
CVE-2014-5117

Tor before 0.2.4.23 and 0.2.5 before 0.2.5.6-alpha maintains a circuit after an inbound RELAY_EARLY cell is received by a client, which makes it easi…

Fix: after 0.2.4.22
Fix from $1,600 2014-07-30
Tor MEDIUM 5.0
CVE-2012-2249

Tor before 0.2.3.23-rc allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a renegotiation attempt that occu…

Fix: after 0.2.3.22
Fix from $1,600 2014-02-03