CVE-2026-44601
Analyzed Analyzed - Analysis Complete
Tor 0.4.9.7 Circuit Queue Memory Double Close Crash

Publication date: 2026-05-07

Last updated on: 2026-05-08

Assigner: MITRE

Description
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.
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Meta Information
Published
2026-05-07
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-07
EPSS Evaluated
2026-06-15
NVD
CVE-2026-44601
EUVD
EUVD-2026-28302
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
torproject tor to 0.4.9.7 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-837 The product requires that an actor should only be able to perform an action once, or to have only one unique action, but the product does not enforce or improperly enforces this restriction.
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Executive Summary

This vulnerability affects Tor versions before 0.4.9.7 and occurs when there is circuit queue memory pressure. It can cause a client crash due to a double close of a circuit, which means the software attempts to close the same circuit twice, leading to instability.

Impact Analysis

The primary impact of this vulnerability is that it can cause the Tor client to crash unexpectedly. This can disrupt your use of the Tor network, potentially causing loss of connectivity or interruption of anonymity services. The CVSS score indicates a low severity with no confidentiality or integrity impact, but it does affect availability.

Mitigation Strategies

The Tor Project strongly recommends upgrading to Tor version 0.4.9.7 immediately to fix this vulnerability.

Compliance Impact

There is no information provided in the available context or resources about how CVE-2026-44601 affects compliance with common standards and regulations such as GDPR or HIPAA.

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