CVE-2026-41178 — OpenTelemetry-Go's baggage parsing no longer caps raw header length

Affected: open-telemetry go.opentelemetry.io/otel/baggage, open-telemetry go.opentelemetry.io/otel/propagation

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Versions 1.41.0 and 1.43.0 removed raw-length rejection and it causes `Parse` to process arbitrarily large/invalid baggage headers and log errors, enabling DoS via oversized inputs. Versions 1.42.0 and 1.44.0 fix the issue.

GHSA-gcjh-h69q-9w9g — cel-go: JSON Private Fields Exposed via NativeTypes and ParseStructTag

Affected: Go: github.com/google/cel-go

The function `ext.NativeTypes(ParseStructTag("json"))` does not honour the `encoding/json` skip directive `json:"-"`. Fields tagged `json:"-"` are registered in the CEL type system under the literal name `"-"` and are readable from any user-submitted CEL expression via `dyn(obj)["-"]`.

Additionally, `newNativeTypes` silently registers every nested struct reachable from the type passed to `NativeTypes`, including types from third-party dependencies the developer never examined.

## Root cause

In `fieldNameByTag`, the helper used by `ParseStructTag("json")` to translate Go struct tags into CEL field names.

See at `ext/native.go:146`:

```go func fieldNameByTag(structTagToParse string) func(field reflect.StructField) string { return func(field reflect.StructField) string { tag, found := field.Tag.Lookup(structTagToParse) if found { splits := strings.Split(tag, ",") if len(splits) > 0 { // We make the assumption that the leftmost entry in the tag is the name. // This seems to be true for most tags that have the concept of a name/key, such as: // https://pkg.go.dev/encoding/xml#Marshal // https://pkg.go.dev/encoding/json#Marshal // https://pkg.go.dev/go.mongodb.org/mongo-driver/bson#hdr-Structs // https://pkg.go.dev/go.yaml.in/yaml/v3#Marshal name := splits[0] return name } }

re…

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CVE-2026-41178 — OpenTelemetry-Go's baggage parsing no longer caps raw header length

GHSA-gcjh-h69q-9w9g — cel-go: JSON Private Fields Exposed via NativeTypes and ParseStructTag