opentelemetry-go: AttributeValueLengthLimit is fully bypassed by attribute values composed of valid U+FFFD runes

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-128085
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-13 19:19:31 UTC
Updated2026-11-13 19:19:31 UTC
DescriptionOpenTelemetry-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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-135 | CWE-770 | CWE-135 CWE-135: Incorrect Calculation of Multi-Byte String Length | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-telemetry Opentelemetry-go affected >= 0.9.0, < 1.47.0 Not specified
CNA Open-telemetry Go.opentelemetry.io/otel/sdk affected >= 1.33.0, < 1.47.0 Not specified
CNA Open-telemetry Go.opentelemetry.io/otel/sdk affected >= 0.9.0, < 1.47.0 Not specified
CNA Open-telemetry Go.opentelemetry.io/otel/sdk affected >= 1.35.0, < 1.47.0 Not specified

References

ReferenceSourceLinkTags
github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-q7gw... [email protected] github.com
github.com/open-telemetry/opentelemetry-go/releases/tag/trace/v1.47.0 [email protected] github.com
github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.47.0 [email protected] github.com
github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/log/v1.47.0 [email protected] github.com
github.com/open-telemetry/opentelemetry-go/commit/017b08c7f1018b619991aa... [email protected] github.com
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