{"api_version":"1","generated_at":"2026-11-13T22:38:15+00:00","cve":"CVE-2026-128886","urls":{"html":"https://cve.report/CVE-2026-128886","api":"https://cve.report/api/cve/CVE-2026-128886.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-128886","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-128886"},"summary":{"title":"Dbus: server accept watch can be stalled by blocking nonce-tcp accept_with_noncefile path","description":"A flaw was found in dbus when configured with the nonce-tcp transport. An unauthenticated attacker able to connect to an exposed listener can cause a Denial of Service (DoS) by opening a connection and withholding the expected authentication token. Because the server processes this verification without enforcing a timeout, the stalled connection blocks the accept process and prevents legitimate clients from establishing new connections.","state":"PUBLISHED","assigner":"redhat","published_at":"2026-11-13 22:17:23","updated_at":"2026-11-13 22:17:23"},"problem_types":["CWE-1322","CWE-1322 Use of Blocking Code in Single-threaded, Non-blocking Context"],"metrics":[{"version":"3.1","source":"secalert@redhat.com","type":"Primary","score":"6.2","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":6.2,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"6.2","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.2,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2472930","name":"https://bugzilla.redhat.com/show_bug.cgi?id=2472930","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://access.redhat.com/security/cve/CVE-2026-128886","name":"https://access.redhat.com/security/cve/CVE-2026-128886","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-128886","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128886","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","version":"","platforms":[]}],"timeline":[{"source":"CNA","time":"2026-05-11T20:27:44.000Z","lang":"en","value":"Reported to Red Hat."},{"source":"CNA","time":"2026-08-19T16:20:17.572Z","lang":"en","value":"Made public."}],"solutions":[],"workarounds":[{"source":"CNA","title":"","value":"Disable non-standard `nonce-tcp` listeners in the D-Bus configuration in favor of standard UNIX domain sockets. If network reachability is required, restrict access to trusted hosts using `firewalld`.\n\nTo remove an exposed port from an untrusted firewall zone:\n\n```\nfirewall-cmd --permanent --zone=public --remove-port=<PORT>/tcp\nfirewall-cmd --permanent --zone=trusted --add-source=<TRUSTED_IP_OR_SUBNET>\nfirewall-cmd --reload\n```\n\nCaveats:\nRestricting or disabling network listeners prevents remote clients outside the trusted subnet from connecting to the affected bus.\n\nWarning:\nReloading the firewall rules or altering the D-Bus server configuration requires restarting the affected D-Bus service, which will drop existing connections and temporarily disrupt communications.","time":"","lang":"en"}],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:10"],"defaultStatus":"unknown","packageName":"dbus","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"}],"datePublic":"2026-08-19T16:20:17.572Z","descriptions":[{"lang":"en","value":"A flaw was found in dbus when configured with the nonce-tcp transport. An unauthenticated attacker able to connect to an exposed listener can cause a Denial of Service (DoS) by opening a connection and withholding the expected authentication token. Because the server processes this verification without enforcing a timeout, the stalled connection blocks the accept process and prevents legitimate clients from establishing new connections."}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Moderate"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.2,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1322","description":"Use of Blocking Code in Single-threaded, Non-blocking Context","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-13T21:42:20.482Z","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat"},"references":[{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-128886"},{"name":"RHBZ#2472930","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2472930"}],"timeline":[{"lang":"en","time":"2026-05-11T20:27:44.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-08-19T16:20:17.572Z","value":"Made public."}],"title":"Dbus: server accept watch can be stalled by blocking nonce-tcp accept_with_noncefile path","workarounds":[{"lang":"en","value":"Disable non-standard `nonce-tcp` listeners in the D-Bus configuration in favor of standard UNIX domain sockets. If network reachability is required, restrict access to trusted hosts using `firewalld`.\n\nTo remove an exposed port from an untrusted firewall zone:\n\n```\nfirewall-cmd --permanent --zone=public --remove-port=<PORT>/tcp\nfirewall-cmd --permanent --zone=trusted --add-source=<TRUSTED_IP_OR_SUBNET>\nfirewall-cmd --reload\n```\n\nCaveats:\nRestricting or disabling network listeners prevents remote clients outside the trusted subnet from connecting to the affected bus.\n\nWarning:\nReloading the firewall rules or altering the D-Bus server configuration requires restarting the affected D-Bus service, which will drop existing connections and temporarily disrupt communications."}],"x_generator":{"engine":"cvelib 1.8.0"},"x_redhatCweChain":"CWE-1322: Use of Blocking Code in Single-threaded, Non-blocking Context"}},"cveMetadata":{"assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","assignerShortName":"redhat","cveId":"CVE-2026-128886","datePublished":"2026-11-13T21:42:20.482Z","dateReserved":"2026-11-13T11:51:37.809Z","dateUpdated":"2026-11-13T21:42:20.482Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-13 22:17:23","lastModifiedDate":"2026-11-13 22:17:23","problem_types":["CWE-1322","CWE-1322 Use of Blocking Code in Single-threaded, Non-blocking Context"],"metrics":{"cvssMetricV31":[{"source":"secalert@redhat.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":6.2,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"128886","Ordinal":"1","Title":"Dbus: server accept watch can be stalled by blocking nonce-tcp a","CVE":"CVE-2026-128886","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"128886","Ordinal":"1","NoteData":"A flaw was found in dbus when configured with the nonce-tcp transport. An unauthenticated attacker able to connect to an exposed listener can cause a Denial of Service (DoS) by opening a connection and withholding the expected authentication token. Because the server processes this verification without enforcing a timeout, the stalled connection blocks the accept process and prevents legitimate clients from establishing new connections.","Type":"Description","Title":"Dbus: server accept watch can be stalled by blocking nonce-tcp a"}]}}}