{"cve":"CVE-2026-81872","nvd":{"published":"2026-09-16T21:17:22.467","modified":"2026-09-30T17:43:24.057","status":"Awaiting Analysis","description":"OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to version 0.21.0, the go.opentelemetry.io/otel/sdk/log BatchingProcessor can enter a tight CPU loop when attacker-driven log emission fills its asynchronous export buffer while the exporter is backpressured. NewBatchingProcessor wraps the exporter with newBufferExporter(exporter, 1), and the poll loop calls queue.TryDequeue and bufferExporter.EnqueueExport before immediately signaling pollTrigger whenever the queue remains at or above batchSize. Because a failed nonblocking EnqueueExport leaves the queue length unchanged, the processor repeatedly retries without waiting for its ticker, exhausting CPU and degrading or denying service in the embedding process. This issue is fixed in version 0.21.0.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":6.3},"cvss_v3":null,"cwes":["CWE-400","CWE-834"],"references":["https://github.com/open-telemetry/opentelemetry-go/commit/ba71b09e6ed272e93a669aeaec1e98b1df4cc582","https://github.com/open-telemetry/opentelemetry-go/issues/6797","https://github.com/open-telemetry/opentelemetry-go/pull/8620","https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/log/v0.21.0","https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-hjf4-fphr-2h65"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-81872","score":0.00383,"percentile":0.3206,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-hjf4-fphr-2h65","url":"https://osv.dev/vulnerability/GHSA-hjf4-fphr-2h65","summary":"OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full","modified":"2026-10-01T20:56:06.318497338Z","packages":[{"ecosystem":"Go","name":"go.opentelemetry.io/otel/sdk/log","purl":"pkg:golang/go.opentelemetry.io/otel/sdk/log","ranges":["<0.21.0"],"fixed":["0.21.0"]}]},{"id":"GO-2026-6615","url":"https://osv.dev/vulnerability/GO-2026-6615","summary":"OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full in go.opentelemetry.io/otel/sdk/log","modified":"2026-10-01T20:45:14.982993973Z","packages":[{"ecosystem":"Go","name":"go.opentelemetry.io/otel/sdk/log","purl":"pkg:golang/go.opentelemetry.io/otel/sdk/log","ranges":["<0.21.0"],"fixed":["0.21.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}