Bug 2396448 (CVE-2025-4444)

Summary: CVE-2025-4444 tor: Tor Onion Service Descriptor resource consumption
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Tor. A memory fragmentation issue allows attackers to cause an out-of-memory condition in Tor nodes, resulting in a denial of service and possibly weakening the privacy guarantees of the Tor network.
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Description OSIDB Bzimport 2025-09-18 15:01:32 UTC
A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.