{"id":"CVE-2026-77587","state":"PUBLISHED","title":"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 cl","description":"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.","publishedAt":"2026-08-20T20:47:39.964Z","updatedAt":"2026-08-25T19:09:06.542Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"mitre"},"assigner":"mitre","products":["torproject Tor"],"affected":[{"vendor":"torproject","product":"Tor","defaultStatus":"unaffected","versions":[{"version":"0.4.8.1-alpha","status":"affected","lessThan":"0.4.9.11","versionType":"custom"}]}],"references":["https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog"],"weaknesses":["CWE-911"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77587.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77587","state":"PUBLISHED","datePublished":"2026-08-20T20:47:39.964Z","dateUpdated":"2026-08-25T19:09:06.542Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2026-08-20T20:47:39.624Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"torproject","product":"Tor","defaultStatus":"unaffected","versions":[{"version":"0.4.8.1-alpha","status":"affected","lessThan":"0.4.9.11","versionType":"custom"}]}],"references":[{"url":"https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog"}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-911","description":"CWE-911 Improper Update of Reference Count","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"mitre","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateUpdated":"2026-08-20T20:47:39.964Z"},"x_generator":{"engine":"CVE-Request-form 0.0.1"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*","versionStartIncluding":"0.4.8.1-alpha","versionEndExcluding":"0.4.9.11"}]}]}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T19:08:45.475220Z","id":"CVE-2026-77587","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-25T19:09:06.542Z"}}]}}}