Vulnerability-Lookup

OPENSUSE-SU-2026:21660-1

Vulnerability from csaf_opensuse - Published: 2026-08-25 20:46 - Updated: 2026-09-17 17:42

Summary

Security update for tor

Severity

Important

Notes

Title of the patch: Security update for tor

Description of the patch: This update for tor fixes the following issues: Changes in tor: - Update to 0.4.9.11 * Major bugfixes + onion services: Prevent a race condition (boo#1275918, CVE-2026-77638) + client: no longer assert and exit if an onion service encodes an all-zero public key for one of its introduction points + directory authorities: Stop allowing 0 as a port in exit policy lines + security, conflux: Fix a use-after-free (and potential double free) (boo#1275919, CVE-2026-77587, TROVE-2026-026) - Update to 0.4.9.10 * Major bugfixes + conflux, security: Reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. (boo#1275920, CVE-2026-77584, TROVE-2026-025) + client: Resume warning about unsafe socks protocols when SafeSocks is not set. Also resume warning every time when TestSocks is set. + Make clients more consistently expire entry guards 48 to 60 days after they are first used.

Patchnames: openSUSE-Leap-16.0-packagehub-533

CVE-2026-77584

8.2 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: openSUSE Leap 16.0:tor-0:0.4.9.11-bp160.1.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:tor-0:0.4.9.11-bp160.1.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:tor-0:0.4.9.11-bp160.1.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:tor-0:0.4.9.11-bp160.1.1.x86_64	—	Vendor Fix

Threats

Impact important

CVE-2026-77587

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Recommended 4 products, the same list as for CVE-2026-77584

Threats

Impact important

CVE-2026-77638

9 (Critical)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Recommended 4 products, the same list as for CVE-2026-77584

Threats

Impact critical

References

14 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://bugzilla.suse.com/1275918	self
https://bugzilla.suse.com/1275919	self
https://bugzilla.suse.com/1275920	self
https://www.suse.com/security/cve/CVE-2026-77584/	self
https://www.suse.com/security/cve/CVE-2026-77587/	self
https://www.suse.com/security/cve/CVE-2026-77638/	self
https://www.suse.com/security/cve/CVE-2026-77584	external
https://bugzilla.suse.com/1275920	external
https://www.suse.com/security/cve/CVE-2026-77587	external
https://bugzilla.suse.com/1275919	external
https://www.suse.com/security/cve/CVE-2026-77638	external
https://bugzilla.suse.com/1275918	external

JSON

To clipboard

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}

CVE-2026-77584 (GCVE-0-2026-77584)

Vulnerability from cvelistv5 – Published: 2026-08-20 20:38 – Updated: 2026-08-25 19:09

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.

Severity

7 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 19:09 UTC

CWE

CWE-821 - Incorrect Synchronization

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://gitlab.torproject.org/tpo/core/tor/-/raw/…

Impacted products

1 product

Vendor	Product	Version
torproject	Tor	Affected: 0.4.8.1-alpha , < 0.4.9.10 (custom) cpe:2.3:a:torproject:tor::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-77587 (GCVE-0-2026-77587)

Vulnerability from cvelistv5 – Published: 2026-08-20 20:47 – Updated: 2026-08-25 19:09

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.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 19:08 UTC

CWE

CWE-911 - Improper Update of Reference Count

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://gitlab.torproject.org/tpo/core/tor/-/raw/…

Impacted products

1 product

Vendor	Product	Version
torproject	Tor	Affected: 0.4.8.1-alpha , < 0.4.9.11 (custom) cpe:2.3:a:torproject:tor::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-77638 (GCVE-0-2026-77638)

Vulnerability from cvelistv5 – Published: 2026-08-20 20:52 – Updated: 2026-08-27 16:06

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.

Severity

8.9 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 15:44 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://gitlab.torproject.org/tpo/core/tor/-/raw/…

Impacted products

1 product

Vendor	Product	Version
torproject	Tor	Affected: 0.3.5.3-alpha , < 0.4.9.11 (custom) cpe:2.3:a:torproject:tor::::::::

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OPENSUSE-SU-2026:21660-1

CVE-2026-77584 (GCVE-0-2026-77584)

CVE-2026-77587 (GCVE-0-2026-77587)

CVE-2026-77638 (GCVE-0-2026-77638)

Tags

Sightings

Nomenclature

Related by attack behaviour