Truncation Vulnerability in OpenTelemetry-Go Affecting SDK and Trace Products
CVE-2026-128085

5.3MEDIUM

Key Information:

Vendor

Open-telemetry

Status
Opentelemetry-go
Go.opentelemetry.io/otel/sdk
Vendor
CVE Published:
13 November 2026

What is CVE-2026-128085?

The OpenTelemetry-Go implementation experiences a truncation vulnerability in versions from 1.33.0 to 1.47.0. The truncation paths within its SDK, log, and trace components fail to accurately account for valid U+FFFD replacement characters. As a result, attributes controlled by attackers can exceed preset character and memory limits, leading to increased memory retention and potential pipeline pressure. This issue does not affect confidentiality or integrity. Users are strongly encouraged to update to version 1.47.0 to mitigate this risk.

Affected Version(s)

go.opentelemetry.io/otel/sdk >= 1.33.0, < 1.47.0

go.opentelemetry.io/otel/sdk >= 0.9.0, < 1.47.0

go.opentelemetry.io/otel/sdk >= 1.35.0, < 1.47.0

References

https://github.com/open-telemetry/opentelemetry-go/securi...
x_refsource_CONFIRM
https://github.com/open-telemetry/opentelemetry-go/commit...
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https://github.com/open-telemetry/opentelemetry-go/releas...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.