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Advisory record · GHSA-hjf4-fphr-2h65

OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full

CVSS 6.3 MediumEPSS 0.0038 · 32nd percentile

Published by the GitHub Advisory Database at 29 Sept 2026, 17:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
go.opentelemetry.io/otel/sdk/logGo<0.21.00.21.0
Identifiers
GHSA-hjf4-fphr-2h65 · CVE-2026-81872 · GO-2026-6615
Weakness (CWE)
CWE-400 · CWE-834
Tags
Published
29 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The go.opentelemetry.io/otel/sdk/log package before 0.21.0 is vulnerable: its BatchingProcessor can enter a tight CPU loop when the asynchronous export buffer is full. An attacker who can drive high-volume log emission while the exporter is backpressured can exhaust CPU in the affected process, causing denial of service. Upgrade to go.opentelemetry.io/otel/sdk/log 0.21.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.3 Medium 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0038, the 32nd percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.