Vulnerability Description
OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.10.0 until 1.33.0, the sdk/trace/span.go attribute truncation path can fail to enforce AttributeValueLengthLimit for string and string-slice attributes containing the valid Unicode replacement character U+FFFD. safeTruncateValidUTF8 treats the valid replacement rune as invalid UTF-8 and returns the original input, while strings.ToValidUTF8 leaves that valid rune unchanged, so a second safeTruncate attempt can also return the oversized value. An attacker who controls span attribute content can retain values longer than the configured limit, increasing per-span memory use and weakening denial-of-service protection in the instrumented process. This issue is fixed in version 1.33.0.
Related Weaknesses (CWE)
References
- https://github.com/open-telemetry/opentelemetry-go/commit/e016a78c9f5b24a1c2beea
- https://github.com/open-telemetry/opentelemetry-go/issues/5996
- https://github.com/open-telemetry/opentelemetry-go/pull/5997
- https://github.com/open-telemetry/opentelemetry-go/releases/tag/sdk/v1.33.0
- https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8
- https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-p9f8
FAQ
What is CVE-2026-81869?
CVE-2026-81869 is a documented vulnerability. OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.10.0 until 1.33.0, the sdk/trace/span.go attribute truncation path can fail to enforce AttributeValueLengthLimit for string a...
How severe is CVE-2026-81869?
CVSS scoring is not yet available for CVE-2026-81869. Check NVD for updates.
Is there a patch for CVE-2026-81869?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.