{"items":[{"id":"NVI-00013170","kind":"vulnerability","title":"OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-hjf4-fphr-2h65","CVE-2026-81872"],"plain_summary":"GitHub lists this reviewed advisory for go.opentelemetry.io/otel/sdk/log. 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-827bbee69afbd255deea139677fe8bc9"],"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":[],"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-827bbee69afbd255deea139677fe8bc9","url":"https://github.com/advisories/GHSA-hjf4-fphr-2h65","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-hjf4-fphr-2h65","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:25.558Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-827bbee69afbd255deea139677fe8bc9"],"technology":"go.opentelemetry.io/otel/sdk/log","known_exclusions":[],"conditions_summary":"### Summary\n\nA `BatchingProcessor` in `go.opentelemetry.io/otel/sdk/log` can enter a tight CPU loop when the asynchronous export buffer is full. Under exporter backpressure, attacker-driven high-volume log emission can keep the queue at or above the batch size, causing repeated immediate export retries and a denial of service through CPU exhaustion.\n\nIntroduced in commit: 4af9c20\n\n### Details\n\n`NewBatchingProcessor` wraps the exporter with `newBufferExporter(exporter, 1)` (`sdk/log/batch.go:116-122`), so the asynchronous export input can fill quickly when the downstream exporter blocks. The poll goroutine dequeues a batch with `b.q.TryDequeue`, calls `b.exporter.EnqueueExport(r)`, and then immediately sends on `b.pollTrigger` whenever `qLen >= b.batchSize` (`sdk/log/batch.go:129-165`).\n\n`bufferExporter.EnqueueExport` is non-blocking: it sends to `e.input` if possible and returns `false` in the `default` case when the channel is full (`sdk/log/exporter.go:221-248`). `TryDequeue` leaves `q.len` unchanged when the write callback returns `false` (`sdk/log/batch.go:289-314`). Therefore, while the exporter is backpressured, `EnqueueExport` fails, the queue remains at or above one full ba","public_affected_ranges":["< 0.21.0"]}],"null_published_at":"2026-11-01T07:29:12.927Z","source_updated_at":"2026-09-29T17:59:54.000Z","source_disclosed_at":"2026-09-29T17:59:53.000Z","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"}