Bug 2520788 (CVE-2026-77587)

Summary: CVE-2026-77587 Tor: Tor: Denial of Service via use-after-free vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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 malicious exit node could exploit a use-after-free vulnerability in the handling of conflux objects. This occurs when a recovery leg attempts to revive a conflux set whose last linked leg has already been closed. Successful exploitation of this flaw could lead to a client crash, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2521979, 2521980    
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Description OSIDB Bzimport 2026-08-20 21:03:58 UTC
Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.