{"items":[{"id":"NVI-00013221","kind":"vulnerability","title":"Nodemailer: Process-global DNS cache reuses TLS `servername` across transports, enabling cross-tenant SMTP credential disclosure","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-6vj9-mwq6-2f5v"],"plain_summary":"GitHub lists this reviewed advisory for nodemailer. 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-9759d15c3f6c6b72c44d8419ed2f3a7d"],"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":"2026-09-28T21:57:00.000Z","value":"5.9 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-9759d15c3f6c6b72c44d8419ed2f3a7d"}],"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-9759d15c3f6c6b72c44d8419ed2f3a7d","url":"https://github.com/advisories/GHSA-6vj9-mwq6-2f5v","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6vj9-mwq6-2f5v","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:25.558Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-9759d15c3f6c6b72c44d8419ed2f3a7d"],"technology":"nodemailer","known_exclusions":[],"conditions_summary":"### Summary\n\nNodemailer's process-global DNS cache is keyed only by `host`, but each cache entry also stores the caller-specific TLS `servername`. When two direct SMTPS transports use the same DNS host with different `tls.servername` values, the first transport's server name is returned to the second transport and overwrites its explicitly configured value.\n\nAs a result, Nodemailer sends the wrong SNI value and verifies the peer certificate against the wrong identity. In a multi-tenant service or SNI-routed SMTP gateway, one tenant can prime the cache so that a victim transport connects to the attacker's TLS virtual host, accepts the attacker's certificate with `rejectUnauthorized: true`, and sends the victim's SMTP credentials to it.\n\n## Affected component\n\n- **Ecosystem:** npm\n- **Package:** `nodemailer`\n- **Repository:** https://github.com/nodemailer/nodemailer\n- **Tested version:** `10.0.1`\n- **Tested commit:** `40d52215aac65b811d7e131bc916f68605efd9d2`\n- **Runtime-confirmed vulnerable versions:** `5.0.0` and `10.0.1`\n- **Affected versions:** `>= 5.0.0, <= 10.0.1`\n- **Patched versions:** None known at the time of this report\n- **Affected mode:** Direct TLS/SMTPS connections (`s","public_affected_ranges":[">= 5.0.0, < 10.0.2"]}],"null_published_at":"2026-11-01T07:29:12.930Z","source_updated_at":"2026-09-28T21:57:00.000Z","source_disclosed_at":"2026-09-28T21:56:05.000Z","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":"2026-11-01T07:24:25.558Z"}],"next_cursor":null,"snapshot_revision":"42594"}