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13 vulnerabilities found for Tor by torproject
CVE-2026-77642 (GCVE-0-2026-77642)
Vulnerability from cvelistv5
Published
2026-08-20 21:15
Modified
2026-08-27 16:07
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-787 - Out-of-bounds Write
Summary
tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or detached signature with unexpected signature digest type. Impact is minor for most Tor roles, but potentially major for directory authorities. This is TROVE-2026-019.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0.2.8.2-alpha < 0.4.9.9 |
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CVE-2026-77641 (GCVE-0-2026-77641)
Vulnerability from cvelistv5
Published
2026-08-20 21:09
Modified
2026-08-27 16:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-252 - Unchecked Return Value
Summary
tor before 0.4.9.9 was prone to a NULL write after free when sending a CONFLUX_SWITCH cell fails. The return value of relay_send_command_from_edge() was ignored, so a send failure (which calls circuit_mark_for_close() and removes the leg via cfx_del_leg()) would go undetected, causing the caller to write to the now-freed current leg and resulting in a crash. This is TROVE-2026-017.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0.4.8.1-alpha < 0.4.9.9 |
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CVE-2026-77640 (GCVE-0-2026-77640)
Vulnerability from cvelistv5
Published
2026-08-20 21:02
Modified
2026-08-21 20:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Summary
tor before 0.4.9.9 was prone to an infinite loop when decompressing a truncated zlib/gzip stream with done=1. A truncated stream never reaches Z_STREAM_END, causing zlib to return Z_BUF_ERROR with no input remaining, which buf_add_compress() mistook for a full output buffer and retried forever. Fixed by returning TOR_COMPRESS_ERROR in that case so the caller can abort cleanly. This is TROVE-2026-021.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0.2.6.1-alpha < 0.4.9.9 |
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CVE-2026-77639 (GCVE-0-2026-77639)
Vulnerability from cvelistv5
Published
2026-08-20 20:57
Modified
2026-08-21 20:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-420 - Unprotected Alternate Channel
Summary
Tor before 0.4.9.9 was prone to a compression bomb bypass where an attacker could concatenate many gzip or zlib sub-streams, each just under the per-stream detection threshold, to avoid the compression bomb check entirely. This is TROVE-2026-022.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0.3.1.1-alpha < 0.4.9.9 |
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CVE-2026-77638 (GCVE-0-2026-77638)
Vulnerability from cvelistv5
Published
2026-08-20 20:52
Modified
2026-08-27 16:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Summary
Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion service that the client was trying to reach.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0.3.5.3-alpha < 0.4.9.11 |
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CVE-2026-77587 (GCVE-0-2026-77587)
Vulnerability from cvelistv5
Published
2026-08-20 20:47
Modified
2026-08-25 19:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-911 - Improper Update of Reference Count
Summary
Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0.4.8.1-alpha < 0.4.9.11 |
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CVE-2026-77584 (GCVE-0-2026-77584)
Vulnerability from cvelistv5
Published
2026-08-20 20:38
Modified
2026-08-25 19:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-821 - Incorrect Synchronization
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0.4.8.1-alpha < 0.4.9.10 |
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CVE-2026-44603 (GCVE-0-2026-44603)
Vulnerability from cvelistv5
Published
2026-05-07 03:21
Modified
2026-05-07 14:58
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-193 - Off-by-one Error
Summary
Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0 < 0.4.9.7 |
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CVE-2026-44602 (GCVE-0-2026-44602)
Vulnerability from cvelistv5
Published
2026-05-07 03:17
Modified
2026-05-07 14:58
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-476 - NULL Pointer Dereference
Summary
Tor before 0.4.9.7 has a NULL pointer dereference when a CERT cell is received out of order, aka TROVE-2026-006.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0 < 0.4.9.7 |
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CVE-2026-44601 (GCVE-0-2026-44601)
Vulnerability from cvelistv5
Published
2026-05-07 03:09
Modified
2026-05-07 14:58
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-837 - Improper Enforcement of a Single, Unique Action
Summary
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-2026-009.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0 < 0.4.9.7 |
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CVE-2026-44600 (GCVE-0-2026-44600)
Vulnerability from cvelistv5
Published
2026-05-07 02:20
Modified
2026-05-07 12:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-696 - Incorrect Behavior Order
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0 < 0.4.9.7 |
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CVE-2026-44599 (GCVE-0-2026-44599)
Vulnerability from cvelistv5
Published
2026-05-07 02:11
Modified
2026-05-07 12:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-669 - Incorrect Resource Transfer Between Spheres
Summary
Tor before 0.4.9.7 can attempt or accept BEGIN_DIR via conflux legs, aka TROVE-2026-008.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0 < 0.4.9.7 |
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CVE-2026-44597 (GCVE-0-2026-44597)
Vulnerability from cvelistv5
Published
2026-05-07 00:56
Modified
2026-05-07 13:12
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-684 - Incorrect Provision of Specified Functionality
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| torproject | Tor |
Version: 0 < 0.4.9.7 |
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