Bug 2573405 (CVE-2026-128085)

Summary: CVE-2026-128085 go.opentelemetry.io/otel/sdk: go.opentelemetry.io/otel/sdk/log: go.opentelemetry.io/otel/trace: OpenTelemetry-Go: Denial of Service via attribute truncation bypass using Unicode replacement characters
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in OpenTelemetry-Go. This vulnerability can lead to a Denial of Service (DoS) through excessive memory consumption. When processing telemetry data such as spans, logs, or traces, the attribute length truncation mechanism fails to account for valid Unicode replacement characters. A remote attacker can supply crafted attributes containing these characters to bypass configured size limits, causing the application to retain unbounded memory and experience resource exhaustion.
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Description OSIDB Bzimport 2026-11-13 19:01:30 UTC 
OpenTelemetry-Go is the Go implementation of OpenTelemetry. From SDK version 1.33.0, SDK log version 0.9.0, and trace version 1.35.0 until version 1.47.0, the AttributeValueLengthLimit and WithAttributeValueLengthLimit truncation paths in sdk/internal/attrnorm, sdk/log/internal/attrnorm, and trace/auto.go do not count valid U+FFFD replacement characters. This is a distinct incomplete-fix defect in the replacement truncation code introduced by the remediation for CVE-2026-81869. Values composed of or dominated by those characters can therefore exceed the configured character and memory bound in span, log-record, and auto-instrumentation trace attributes. Attacker-controlled telemetry attributes can increase retained memory and pipeline pressure, while confidentiality and integrity are not affected. This issue is fixed in version 1.47.0.