Tor up to 0.4.9.7 incorrect provision of specified functionality

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.7$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Tor up to 0.4.9.7. This impacts an unknown function. The manipulation results in incorrect provision of specified functionality. This vulnerability was named CVE-2026-44597. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Tor up to 0.4.9.7. It has been classified as problematic. Affected is an unknown function. The manipulation with an unknown input leads to a incorrect provision of specified functionality vulnerability. CWE is classifying the issue as CWE-684. The code does not function according to its published specifications, potentially leading to incorrect usage. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at forum.torproject.org. This vulnerability is traded as CVE-2026-44597 since 05/07/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/13/2026).

The vulnerability scanner Nessus provides a plugin with the ID 313068 (Linux Distros Unpatched Vulnerability : CVE-2026-44597), 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 8f98054b1982d00a14639864d03e9afd90b87481 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 CNNVD (CNNVD-202605-1455), Tenable (313068) and CERT Bund (WID-SEC-2026-1398). Once again VulDB remains the best 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
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Incorrect provision of specified functionality
CWE: CWE-684
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 313068
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-44597

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Tor 0.4.9.7
Patch: 8f98054b1982d00a14639864d03e9afd90b87481

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-2026-44597 (🔒)
GCVE (CVE): GCVE-0-2026-44597
GCVE (VulDB): GCVE-100-361788
CERT Bund: WID-SEC-2026-1398 - Tor: Mehrere Schwachstellen
CNNVD: CNNVD-202605-1455 - Tor 安全漏洞

Entryinfo

Created: 05/07/2026 07:33
Updated: 05/13/2026 15:31
Changes: 05/07/2026 07:33 (64), 05/08/2026 04:07 (2), 05/08/2026 19:04 (6), 05/13/2026 15:31 (7)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!