Improper Handling of Unicode Encoding Affecting golang-opentelemetry-otel package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-GOLANGOPENTELEMETRYOTEL-19964095
- published20 Sept 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-81869 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest golang-opentelemetry-otel.
NVD Description
Note: Versions mentioned in the description apply only to the upstream golang-opentelemetry-otel package and not the golang-opentelemetry-otel package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2026-81869
- https://github.com/open-telemetry/opentelemetry-go/commit/e016a78c9f5b24a1c2beeaad47686c2f2213f49a
- 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-wvj8-2fg8