{"id":"CVE-2026-81872","title":"OpenTelemetry-Go is the Go implementation of OpenTelemetry","summary":"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…","severity":"medium","cvss":6.3,"cvssVector":"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","cwe":["CWE-400","CWE-834","CWE-835"],"vendor":"open-telemetry","product":"opentelemetry-go","affected":["opentelemetry-go < 0.21.0"],"published":"2026-09-16","updated":"2026-09-17","sourceUpdated":"2026-09-17T14:17:32.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81872","references":[{"url":"https://github.com/open-telemetry/opentelemetry-go/commit/ba71b09e6ed272e93a669aeaec1e98b1df4cc582","label":"security-advisories@github.com"},{"url":"https://github.com/open-telemetry/opentelemetry-go/issues/6797","label":"security-advisories@github.com"},{"url":"https://github.com/open-telemetry/opentelemetry-go/pull/8620","label":"security-advisories@github.com"},{"url":"https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/log/v0.21.0","label":"security-advisories@github.com"},{"url":"https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-hjf4-fphr-2h65","label":"security-advisories@github.com"},{"url":"https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-hjf4-fphr-2h65","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81872.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-81872"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535727"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81872"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81872"},{"url":"https://access.redhat.com/errata/RHSA-2026:68715"},{"url":"https://access.redhat.com/errata/RHSA-2026:68716"},{"url":"https://access.redhat.com/errata/RHSA-2026:68821"},{"url":"https://access.redhat.com/errata/RHSA-2026:68926"},{"url":"https://access.redhat.com/errata/RHSA-2026:68778"},{"url":"https://access.redhat.com/errata/RHSA-2026:68717"},{"url":"https://access.redhat.com/errata/RHSA-2026:68729"},{"url":"https://access.redhat.com/errata/RHSA-2026:68910"},{"url":"https://access.redhat.com/errata/RHSA-2026:68272"},{"url":"https://access.redhat.com/errata/RHSA-2026:68290"},{"url":"https://access.redhat.com/errata/RHSA-2026:68591"},{"url":"https://access.redhat.com/errata/RHSA-2026:68905"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T13:36:11.140898Z"},"cvssSource":"cna","ingestedAt":"2026-09-16T21:05:36.880Z","scores":{"cna":6.3,"vendor":5.3},"epss":0.00301,"epssPercentile":0.23041,"patched":["hardened_images"],"slug":"CVE-2026-81872","body":"## Overview\n\nOpenTelemetry-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Assisted Installer for Red Hat OpenShift Container Platform 2, Logging Subsystem for Red Hat OpenShift, Multiarch Tuning Operator, Multicluster Engine for Kubernetes, Multicluster Global Hub, OpenShift Developer Tools and Services, … · no fix planned: Assisted Installer for Red Hat OpenShift Container Platform 2, Logging Subsystem for Red Hat OpenShift, OpenShift Developer Tools and Services, Red Hat Advanced Cluster Management for Kubernetes 2, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81872.json)\n- **RHSA-2026:68715** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68715)\n- **RHSA-2026:68716** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68716)\n- **RHSA-2026:68821** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68821)\n- **RHSA-2026:68926** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68926)\n- **RHSA-2026:68778** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68778)\n- **RHSA-2026:68717** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68717)\n- **RHSA-2026:68729** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68729)\n- **RHSA-2026:68910** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:68910)\n- **RHSA-2026:68272** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68272)\n- **RHSA-2026:68290** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68290)\n- **RHSA-2026:68591** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68591)","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":34.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":206102,"id":"CVE-2026-81872","ts":1789654822887,"field":"exploit_available","old":"false","new":"true"}]}