CVE-2026-81872

Name	CVE-2026-81872
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 (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1149049

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-opentelemetry-otel (PTS)	bookworm	1.1.0-2	fixed
	trixie	1.31.0-4	vulnerable
	forky, sid	1.46.0-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Debian Bugs
golang-opentelemetry-otel	source	experimental	1.46.0-1~exp1
golang-opentelemetry-otel	source	bookworm	(not affected)
golang-opentelemetry-otel	source	(unstable)	(unfixed)	1149049

Notes

[trixie] - golang-opentelemetry-otel <no-dsa> (Minor issue)
[bookworm] - golang-opentelemetry-otel <not-affected> (Vulnerable code introduced in 1.26.0)
https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-hjf4-fphr-2h65
https://github.com/open-telemetry/opentelemetry-go/issues/6797
https://github.com/open-telemetry/opentelemetry-go/pull/8620
Introduced with: https://github.com/open-telemetry/opentelemetry-go/commit/4af9c20a80182e5ac8212182d3ba970d0d558a45 (v1.26.0)
Fixed by: https://github.com/open-telemetry/opentelemetry-go/commit/ba71b09e6ed272e93a669aeaec1e98b1df4cc582 (v1.45.0)