{"items":[{"id":"NVI-00018547","kind":"vulnerability","title":"CoreWCF: Unix Domain Socket PosixIdentity transport accepts connections that skip the security upgrade","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-wjpq-6766-7f5j","CVE-2026-54776"],"plain_summary":"GitHub lists this reviewed advisory for CoreWCF.UnixDomainSocket, CoreWCF.UnixDomainSocket. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-39de0b9a9425481f7a5e5c790bf29bc7"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-19T20:46:53.000Z","value":"4.4 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-39de0b9a9425481f7a5e5c790bf29bc7"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-39de0b9a9425481f7a5e5c790bf29bc7","url":"https://github.com/advisories/GHSA-wjpq-6766-7f5j","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-wjpq-6766-7f5j","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T07:19:16.585Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-39de0b9a9425481f7a5e5c790bf29bc7"],"technology":"CoreWCF.UnixDomainSocket","known_exclusions":[],"conditions_summary":"### Impact\nA CoreWCF service hosted on Unix Domain Sockets with the PosixIdentity client credential type (UnixDomainSocketBinding with Security.Mode = TransportCredentialOnly and Security.Transport.ClientCredentialType = PosixIdentity) does not require the client to perform the application/unixposix stream upgrade before dispatching messages.\n\n### Patches\nFixed in CoreWCF v1.8.1 and v1.9.1\n\n### Workarounds\nRestrict filesystem access to the UDS socket file using owner/group/mode (e.g. chmod 0660 plus a dedicated group) so that only the POSIX users who are already authorized to invoke the service can connect at all. This makes the missing-upgrade behaviour equivalent to the operating system’s filesystem permissions instead of relying on framing-layer identity checks.\nAvoid relying on ServiceSecurityContext.PrimaryIdentity for authorization decisions, or back it up with an authentication-required authorization policy that rejects anonymous principals.","public_affected_ranges":["< 1.8.1"]},{"certainty":"source_listed","source_ids":["sr-39de0b9a9425481f7a5e5c790bf29bc7"],"technology":"CoreWCF.UnixDomainSocket","known_exclusions":[],"conditions_summary":"### Impact\nA CoreWCF service hosted on Unix Domain Sockets with the PosixIdentity client credential type (UnixDomainSocketBinding with Security.Mode = TransportCredentialOnly and Security.Transport.ClientCredentialType = PosixIdentity) does not require the client to perform the application/unixposix stream upgrade before dispatching messages.\n\n### Patches\nFixed in CoreWCF v1.8.1 and v1.9.1\n\n### Workarounds\nRestrict filesystem access to the UDS socket file using owner/group/mode (e.g. chmod 0660 plus a dedicated group) so that only the POSIX users who are already authorized to invoke the service can connect at all. This makes the missing-upgrade behaviour equivalent to the operating system’s filesystem permissions instead of relying on framing-layer identity checks.\nAvoid relying on ServiceSecurityContext.PrimaryIdentity for authorization decisions, or back it up with an authentication-required authorization policy that rejects anonymous principals.","public_affected_ranges":[">= 1.9.0, < 1.9.1"]}],"null_published_at":"2026-11-07T07:07:39.851Z","source_updated_at":"2026-06-19T20:46:53.000Z","source_disclosed_at":"2026-06-19T20:46:52.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-06T07:19:16.585Z"}],"next_cursor":null,"snapshot_revision":"42594"}