Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-81872— OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full

Quick assessment

Affected
open-telemetry opentelemetry-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenTelemetry-Go 是 OpenTelemetry 的 Go 语言实现。在 0.21.0 版本之前， 中的 在攻击者触发的日志输出填满其异步导出缓冲区、且导出器处于背压（backpressure）状态时，可能进入紧密的 CPU 循环。 使用 包装导出器，其轮询循环在队列长度达到或超过 时，会调用 和 ，并立即触发 。由于非阻塞的 失败后队列长度保持不变，处理程序会不断重试而无需等待定时器的下一次触发，从而耗尽 CPU 资源，导致宿主进程中的服务性能下降甚至服务不可用（DoS）。 该问题已在 0.21.

CVSS 6.3 · Medium EPSS 0.38% · P33

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-telemetry opentelemetry-go < 0.21.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-81872

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
OpenTelemetry-Go: BatchProcessor can busy-spin when export buffer is full
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-telemetry opentelemetry-go < 0.21.0 -

II. Public POCs for CVE-2026-81872

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-81872

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-81872 (1)

Other References for CVE-2026-81872 (2)

Same Patch Batch · open-telemetry · 2026-09-16 · 4 CVEs total

CVE-2026-81871 6.3 MEDIUM OpenTelemetry-Go: Log gRPC exporter ignores env TLS certs, bypassing mTLS/pinning
CVE-2026-81869 5.1 MEDIUM OpenTelemetry-Go: UTF-8 replacement rune bypasses attribute length truncation
CVE-2026-81870 2.0 LOW OpenTelemetry-Go: Exporter config logging may leak endpoint URLs in info logs

IV. Related Vulnerabilities

Same product: opentelemetry-go
Same vendor: open-telemetry
Same weakness: CWE-400