CVE-2026-44601

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-07 · updated 2026-10-26
Weakness: CWE-837

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.

Affected products

torproject Tor: before 0.4.9.7 — fixed in 0.4.9.7

How to fix

Upgrade to a fixed version: torproject Tor 0.4.9.7. Check the vendor advisory for mitigations.

References

https://forum.torproject.org/c/news/tor-release-announcement/28
https://gitlab.torproject.org/tpo/core/tor/-/commit/d4e3f6a440b58c2be661decf20c09548704907dc
https://gitlab.torproject.org/tpo/core/tor/-/work_items/41237
https://www.openwall.com/lists/oss-security/2026/05/06/8

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