Sourced from github.com/go-chi/chi/v5's releases.

v5.3.0

What's Changed

• Use strings.ReplaceAll where applicable by @​JRaspass in go-chi/chi#1046
• Propagate inline middlewares across mounted subrouters by @​LukasJenicek in go-chi/chi#1049
• add go 1.26 to ci by @​pkieltyka in go-chi/chi#1052
• Remove last uses of io/ioutil by @​JRaspass in go-chi/chi#1054
• Simplify chi.walk with slices.Concat by @​JRaspass in go-chi/chi#1053
• Apply the stringscutprefix modernizer by @​JRaspass in go-chi/chi#1051
• Bump minimum Go to 1.23, always use request.Pattern by @​JRaspass in go-chi/chi#1048
• middleware: fix httpFancyWriter.ReadFrom double-counting bytes with Tee by @​alliasgher in go-chi/chi#1085
• Fix typo in Route doc comment by @​gouwazi in go-chi/chi#1073
• fix: set Request.Pattern from RoutePattern() by @​leno23 in go-chi/chi#1097
• feat: middleware.ClientIP, a replacement for middleware.RealIP by @​VojtechVitek in go-chi/chi#967

New Contributors

• @​LukasJenicek made their first contribution in go-chi/chi#1049
• @​alliasgher made their first contribution in go-chi/chi#1085
• @​gouwazi made their first contribution in go-chi/chi#1073
• @​leno23 made their first contribution in go-chi/chi#1097

SECURITY: middleware.ClientIP, a replacement for middleware.RealIP

@​VojtechVitek submitted PR #967, which introduces middleware.ClientIP — a replacement for middleware.RealIP that closes the three open spoofing advisories:

• GHSA-9g5q-2w5x-hmxf — IP spoofing via XFF in RemoteAddr resolution (convto)
• GHSA-rjr7-jggh-pgcp — RealIP allows IP spoofing via unvalidated XFF (rezmoss)
• GHSA-3fxj-6jh8-hvhx — IP spoofing in middleware.RealIP (Saku0512, Critical / 9.3)

It also addresses issues outlined at:

• go-chi/chi#708
• https://adam-p.ca/blog/2022/03/x-forwarded-for/
• go-chi/chi#711
• go-chi/chi#453
• go-chi/chi#908

middleware.RealIP is deprecated in this PR with pointers to the new API.

The deprecation only adds a // Deprecated: doc comment; the function keeps working for backward compatibility.

Why a new middleware (not "fix RealIP in place")

RealIP has two unfixable design choices: it mutates r.RemoteAddr, and it tries to be a one-size-fits-all default by walking a hard-coded list of headers any client can supply. Per adam-p's "The perils of the 'real' client IP" (which calls chi out by name on this), there is no safe default — the user must pick their trust source explicitly.

The new API

Four middlewares, two accessors. Pick exactly one middleware based on your infrastructure, read the result with one of the two accessors:

// One of the four. There is no safe default — pick exactly one.
func ClientIPFromHeader(trustedHeader string) func(http.Handler) http.Handler
func ClientIPFromXFF(trustedIPPrefixes ...string) func(http.Handler) http.Handler
func ClientIPFromXFFTrustedProxies(numTrustedProxies int) func(http.Handler) http.Handler
</tr></table> 

... (truncated)

• 3b17157 feat: middleware.ClientIP, a replacement for middleware.RealIP (#967)
• 818fdcf fix: set Request.Pattern from RoutePattern() (#1097)
• f975af0 Fix typo in Route doc comment (#1073)
• 4ef87ea middleware: fix httpFancyWriter.ReadFrom double-counting bytes with Tee (#1085)
• a54874f Bump minimum Go to 1.23, always use request.Pattern (#1048)
• 3328d4d Apply the stringscutprefix modernizer (#1051)
• be60b2e Simplify chi.walk with slices.Concat (#1053)
• a36a925 Remove last uses of io/ioutil (#1054)
• 7d93ee3 add go 1.26 to ci (#1052)
• 903cff2 Propagate inline middlewares across mounted subrouters (#1049)
• Additional commits viewable in compare view

Sourced from go.opentelemetry.io/otel's changelog.

[1.44.0/0.66.0/0.20.0/0.0.17] 2026-05-27

Added

• Add ByteSlice and ByteSliceValue functions for new BYTESLICE attribute type in go.opentelemetry.io/otel/attribute. (#7948)
• Apply attribute value limit to the KindBytes attribute type in go.opentelemetry.io/otel/sdk/log. (#7990)
• Apply attribute value limit to the BYTESLICE attribute type in go.opentelemetry.io/otel/sdk/trace. (#7990)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/trace. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlptrace. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlplog. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlpmetric. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/zipkin. (#8153)
• Add String method for Value type in go.opentelemetry.io/otel/attribute. (#8142)
• Add Slice and SliceValue functions for new SLICE attribute type in go.opentelemetry.io/otel/attribute. (#8166)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlptrace. (#8216)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlplog. (#8216)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlpmetric. (#8216)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/zipkin. (#8216)
• Apply AttributeValueLengthLimit to attribute.SLICE type attribute values in go.opentelemetry.io/otel/sdk/trace, recursively truncating contained string values. (#8217)
• Add Error field on Record type in go.opentelemetry.io/otel/log/logtest. (#8148)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#8157)
• Add Settable to go.opentelemetry.io/otel/metric/x to allow reusing attribute options. (#8178)
• Add experimental support for splitting metric data across multiple batches in go.opentelemetry.io/otel/sdk/metric. Set OTEL_GO_X_METRIC_EXPORT_BATCH_SIZE=<max_size> to enable for all periodic readers. See go.opentelemetry.io/otel/sdk/metric/internal/x for feature documentation. (#8071)
• Add experimental self-observability metrics in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc. Enable with OTEL_GO_X_SELF_OBSERVABILITY=true environment variable. See go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal/x for feature documentation. (#8192)
• Add experimental self-observability metrics in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp. Enable with OTEL_GO_X_SELF_OBSERVABILITY=true environment variable. See go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/x for feature documentation. (#8194)
• Add experimental self-observability metrics in go.opentelemetry.io/otel/exporters/stdout/stdoutlog. Enable with OTEL_GO_X_SELF_OBSERVABILITY=true environment variable. See go.opentelemetry.io/otel/stdout/stdoutlog/internal/x for feature documentation. (#8263)
• Add WithDefaultAttributes to go.opentelemetry.io/otel/metric/x to support setting default attributes on instruments. (#8135)
• Add go.opentelemetry.io/otel/semconv/v1.41.0 package. The package contains semantic conventions from the v1.41.0 version of the OpenTelemetry Semantic Conventions. See the migration documentation for information on how to upgrade from go.opentelemetry.io/otel/semconv/v1.40.0. (#8324)
• Add Observable variants of instruments to go.opentelemetry.io/otel/semconv/v1.41.0 package. (#8350)
• Generate explicit histogram bucket boundaries from weaver configuration for HTTP and RPC duration instruments in go.opentelemetry.io/otel/semconv/v1.41.0. (#8002)

Changed

• ⚠️ Breaking Change: go.opentelemetry.io/otel/sdk/metric now applies a default cardinality limit of 2000 to comply with the Metrics SDK specification recommendation. New attribute sets are dropped when the cardinality limit is reached. The measurement of these sets are aggregated into a special attribute set containing attribute.Bool("otel.metric.overflow", true).

... (truncated)

• b62d928 Release 1.44.0 (#8376)
• 94132a0 chore(deps): update golang.org/x/telemetry digest to 5997936 (#8379)
• 6fdcf82 feat: add self-observability metrics to otlpmetricgrpc metric exporters (#8192)
• 761bbfc fix(deps): update golang.org/x (#8377)
• 3a91dc6 fix(deps): update googleapis to 3dc84a4 (#8375)
• f593185 exporters/otlp: default max request size to 64 MiB (#8365)
• f02feac Merge commit from fork
• 36c2f1b semconvkit: add invariant test for histogram-exclusion rule (#8370)
• d0b6cbd sdk/metric: document unit-sensitivity of DefaultAggregationSelector (#8224)
• 9a68034 add self observability for stdout exporter (#8263)
• Additional commits viewable in compare view

Sourced from go.opentelemetry.io/otel/trace's changelog.

[1.44.0/0.66.0/0.20.0/0.0.17] 2026-05-27

Added

• Add ByteSlice and ByteSliceValue functions for new BYTESLICE attribute type in go.opentelemetry.io/otel/attribute. (#7948)
• Apply attribute value limit to the KindBytes attribute type in go.opentelemetry.io/otel/sdk/log. (#7990)
• Apply attribute value limit to the BYTESLICE attribute type in go.opentelemetry.io/otel/sdk/trace. (#7990)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/trace. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlptrace. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlplog. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlpmetric. (#8153)
• Support BYTESLICE attributes in go.opentelemetry.io/otel/exporters/zipkin. (#8153)
• Add String method for Value type in go.opentelemetry.io/otel/attribute. (#8142)
• Add Slice and SliceValue functions for new SLICE attribute type in go.opentelemetry.io/otel/attribute. (#8166)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlptrace. (#8216)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlplog. (#8216)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/otlp/otlpmetric. (#8216)
• Support SLICE attributes in go.opentelemetry.io/otel/exporters/zipkin. (#8216)
• Apply AttributeValueLengthLimit to attribute.SLICE type attribute values in go.opentelemetry.io/otel/sdk/trace, recursively truncating contained string values. (#8217)
• Add Error field on Record type in go.opentelemetry.io/otel/log/logtest. (#8148)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc. (#8157)
• Add WithMaxRequestSize option in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#8157)
• Add Settable to go.opentelemetry.io/otel/metric/x to allow reusing attribute options. (#8178)
• Add experimental support for splitting metric data across multiple batches in go.opentelemetry.io/otel/sdk/metric. Set OTEL_GO_X_METRIC_EXPORT_BATCH_SIZE=<max_size> to enable for all periodic readers. See go.opentelemetry.io/otel/sdk/metric/internal/x for feature documentation. (#8071)
• Add experimental self-observability metrics in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc. Enable with OTEL_GO_X_SELF_OBSERVABILITY=true environment variable. See go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal/x for feature documentation. (#8192)
• Add experimental self-observability metrics in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp. Enable with OTEL_GO_X_SELF_OBSERVABILITY=true environment variable. See go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/x for feature documentation. (#8194)
• Add experimental self-observability metrics in go.opentelemetry.io/otel/exporters/stdout/stdoutlog. Enable with OTEL_GO_X_SELF_OBSERVABILITY=true environment variable. See go.opentelemetry.io/otel/stdout/stdoutlog/internal/x for feature documentation. (#8263)
• Add WithDefaultAttributes to go.opentelemetry.io/otel/metric/x to support setting default attributes on instruments. (#8135)
• Add go.opentelemetry.io/otel/semconv/v1.41.0 package. The package contains semantic conventions from the v1.41.0 version of the OpenTelemetry Semantic Conventions. See the migration documentation for information on how to upgrade from go.opentelemetry.io/otel/semconv/v1.40.0. (#8324)
• Add Observable variants of instruments to go.opentelemetry.io/otel/semconv/v1.41.0 package. (#8350)
• Generate explicit histogram bucket boundaries from weaver configuration for HTTP and RPC duration instruments in go.opentelemetry.io/otel/semconv/v1.41.0. (#8002)

Changed

• ⚠️ Breaking Change: go.opentelemetry.io/otel/sdk/metric now applies a default cardinality limit of 2000 to comply with the Metrics SDK specification recommendation. New attribute sets are dropped when the cardinality limit is reached. The measurement of these sets are aggregated into a special attribute set containing attribute.Bool("otel.metric.overflow", true).

... (truncated)

• b62d928 Release 1.44.0 (#8376)
• 94132a0 chore(deps): update golang.org/x/telemetry digest to 5997936 (#8379)
• 6fdcf82 feat: add self-observability metrics to otlpmetricgrpc metric exporters (#8192)
• 761bbfc fix(deps): update golang.org/x (#8377)
• 3a91dc6 fix(deps): update googleapis to 3dc84a4 (#8375)
• f593185 exporters/otlp: default max request size to 64 MiB (#8365)
• f02feac Merge commit from fork
• 36c2f1b semconvkit: add invariant test for histogram-exclusion rule (#8370)
• d0b6cbd sdk/metric: document unit-sensitivity of DefaultAggregationSelector (#8224)
• 9a68034 add self observability for stdout exporter (#8263)
• Additional commits viewable in compare view