Impact

Multiple @opentelemetry/instrumentation- packages recorded the database connection username as the db.user span attribute on every instrumented database operation. This attribute was emitted unconditionally — it was not gated by enhancedDatabaseReporting or any other opt-in flag, and it was the default behaviour for all users of the affected packages until the patched releases shipped on 2026-07-23.

The attribute is forwarded to every configured observability backend (Jaeger, Zipkin, Datadog, OTLP collectors, etc.). Depending on the database account naming convention in use, the exported value may reveal:

- Internal service account names that disclose architecture topology. - Role-encoded usernames (e.g. adminreadwrite, appreadonlyprod) useful for privilege inference. - Database account naming patterns useful for credential enumeration.

Affected packages (all are vulnerable from the first published version through the version listed below):

| Package | Vulnerable range | Patched version | |---------|-----------------|-----------------| | @opentelemetry/instrumentation-cassandra-driver | < 0.66.0 | 0.66.0 | | @opentelemetry/instrumentation-knex | < 0.65.0 | 0.65.0 | | @opentelemetry/instrumentation-mongoose | < 0.67.0 | 0.67.0 | | @opentelemetry/instrumentation-mysql | < 0.67.0 | 0.67.0 | | @opentelemetry/instrumentation-mysql2 | < 0.67.0 | 0.67.0 | | @opentelemetry/instrumentation-oracledb | < 0.46.0 | 0.46.0 | | @opentelemetry/instrumentation-pg | < 0.73.0 | 0.73.0 | | @opentelemetry/instrumentation-tedious | < 0.40.0 | 0.40.0 |

Patches

Fixed in the coordinated release on 2026-07-23 via feat!: only emit stable http, network and database attributes (#3585).

Upgrade to the patched version listed in the table above for each instrumentation package in use.

Workarounds

No configuration-level workaround exists in the affected versions: the db.user attribute cannot be suppressed without patching. As a partial mitigation, a custom SpanProcessor can be used to strip db.user from spans before they leave the process:

ts // Example: drop db.user in a custom SpanProcessor class StripDbUserProcessor implements SpanProcessor { onStart(span: Span) { span.setAttribute('db.user', null); } onEnd() {} shutdown() { return Promise.resolve(); } forceFlush() { return Promise.resolve(); } }

Users who control the downstream collector can also filter the attribute at the collector pipeline level.