Tor up to 0.4.9.7 null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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3.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Tor up to 0.4.9.7. It has been classified as problematic. The affected element is an unknown function. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2026-44602. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Tor up to 0.4.9.7. It has been declared as problematic. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

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

It is possible to read the advisory at forum.torproject.org. This vulnerability is known as CVE-2026-44602 since 05/07/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/13/2026).

The vulnerability scanner Nessus provides a plugin with the ID 313061 (Linux Distros Unpatched Vulnerability : CVE-2026-44602), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.4.9.7 eliminates this vulnerability. Applying the patch df7d5174ef41814d806c8ede776e230cd30ac12b is able to eliminate this problem. The bugfix is ready for download at gitlab.torproject.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (313061), EUVD (EUVD-2026-28304) and CERT Bund (WID-SEC-2026-1398). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • SUSE openSUSE
  • Open Source Tor

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.7
CNA Vector (MITRE): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 313061
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-44602

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Tor 0.4.9.7
Patch: df7d5174ef41814d806c8ede776e230cd30ac12b

Timelineinfo

05/07/2026 Advisory disclosed
05/07/2026 +0 days CVE reserved
05/07/2026 +0 days VulDB entry created
05/13/2026 +6 days VulDB entry last update

Sourcesinfo

Advisory: forum.torproject.org
Status: Confirmed

CVE: CVE-2026-44602 (🔒)
GCVE (CVE): GCVE-0-2026-44602
GCVE (VulDB): GCVE-100-361807
EUVD: 🔒
CERT Bund: WID-SEC-2026-1398 - Tor: Mehrere Schwachstellen

Entryinfo

Created: 05/07/2026 07:45
Updated: 05/13/2026 15:31
Changes: 05/07/2026 07:45 (65), 05/07/2026 10:23 (1), 05/08/2026 05:23 (2), 05/13/2026 15:31 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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