CVE-2026-128886

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-128886", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-11-13T11:51:37.809Z", "datePublished": "2026-11-13T21:42:20.482Z", "dateUpdated": "2026-11-13T21:42:20.482Z"}, "containers": {"cna": {"title": "Dbus: server accept watch can be stalled by blocking nonce-tcp accept_with_noncefile path", "metrics": [{"other": {"content": {"value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/"}, "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"}], "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."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "dbus", "defaultStatus": "unknown", "cpes": ["cpe:/a:redhat:enterprise_linux:10"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-128886", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2472930", "name": "RHBZ#2472930", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-08-19T16:20:17.572Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-1322", "description": "Use of Blocking Code in Single-threaded, Non-blocking Context", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-1322: Use of Blocking Code in Single-threaded, Non-blocking Context", "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."}], "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."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-13T21:42:20.482Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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