Answer in brief
CVE-2026-128085 records a Medium severity (CVSS 5.3) vulnerability in opentelemetry-go: AttributeValueLengthLimit is fully bypassed by attribute values composed of valid U+FFFD runes. The current sources do not mark it as known exploited. The current feed maps open-telemetry/go.opentelemetry.io/otel/sdk (generic), open-telemetry/go.opentelemetry.io/otel/sdk (generic), open-telemetry/go.opentelemetry.io/otel/sdk (generic), open-telemetry/opentelemetry-go (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps open-telemetry/go.opentelemetry.io/otel/sdk (generic), open-telemetry/go.opentelemetry.io/otel/sdk (generic), open-telemetry/go.opentelemetry.io/otel/sdk (generic), open-telemetry/opentelemetry-go (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| open-telemetry/go.opentelemetry.io/otel/sdkgeneric | >=1.33.0 <1.47.0 | 1.47.0 |
| open-telemetry/go.opentelemetry.io/otel/sdkgeneric | >=0.9.0 <1.47.0 | 1.47.0 |
| open-telemetry/go.opentelemetry.io/otel/sdkgeneric | >=1.35.0 <1.47.0 | 1.47.0 |
| open-telemetry/opentelemetry-gogeneric | >=0.9.0 <1.47.0 | 1.47.0 |
| go.opentelemetry.io/otel/sdkgo | >=1.33.0,<1.47.0 | 1.47.0 |
| go.opentelemetry.io/otel/sdkgo | >=1.33.0 <1.47.0 | 1.47.0 |
| go.opentelemetry.io/otel/sdk/loggo | >=0.9.0,<1.47.0 | 1.47.0 |
| go.opentelemetry.io/otel/sdk/loggo | >=0.9.0 <1.47.0 | 1.47.0 |
| go.opentelemetry.io/otel/tracego | >=1.35.0,<1.47.0 | 1.47.0 |
| go.opentelemetry.io/otel/tracego | >=1.35.0 <1.47.0 | 1.47.0 |
Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 13, 2026
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.
Quoted source text, attributed separately from HOL analysis.