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This PR contains the following updates:

Package Change Age Confidence
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.42.0 -> v0.44.0 age confidence

GitHub Vulnerability Alerts

CVE-2023-45142

Summary

This handler wrapper https://github.com/open-telemetry/opentelemetry-go-contrib/blob/5f7e6ad5a49b45df45f61a1deb29d7f1158032df/instrumentation/net/http/otelhttp/handler.go#L63-L65
out of the box adds labels

  • http.user_agent
  • http.method

that have unbound cardinality. It leads to the server's potential memory exhaustion when many malicious requests are sent to it.

Details

HTTP header User-Agent or HTTP method for requests can be easily set by an attacker to be random and long. The library internally uses httpconv.ServerRequest that records every value for HTTP method and User-Agent.

PoC

Send many requests with long randomly generated HTTP methods or/and User agents (e.g. a million) and observe how memory consumption increases during it.

Impact

In order to be affected, the program has to configure a metrics pipeline, use otelhttp.NewHandler wrapper, and does not filter any unknown HTTP methods or User agents on the level of CDN, LB, previous middleware, etc.

Others

It is similar to already reported vulnerabilities

Workaround for affected versions

As a workaround to stop being affected otelhttp.WithFilter() can be used, but it requires manual careful configuration to not log certain requests entirely.

For convenience and safe usage of this library, it should by default mark with the label unknown non-standard HTTP methods and User agents to show that such requests were made but do not increase cardinality. In case someone wants to stay with the current behavior, library API should allow to enable it.

The other possibility is to disable HTTP metrics instrumentation by passing otelhttp.WithMeterProvider option with noop.NewMeterProvider.

Solution provided by upgrading

In PR https://github.com/open-telemetry/opentelemetry-go-contrib/pull/4277, released with package version 0.44.0, the values collected for attribute http.request.method were changed to be restricted to a set of well-known values and other high cardinality attributes were removed.

References


OpenTelemetry-Go Contrib vulnerable to denial of service in otelhttp due to unbound cardinality metrics

CGA-h2vq-f2rf-jwrq / CVE-2023-45142 / GHSA-rcjv-mgp8-qvmr / GO-2023-2113

More information

Details

Summary

This handler wrapper https://github.com/open-telemetry/opentelemetry-go-contrib/blob/5f7e6ad5a49b45df45f61a1deb29d7f1158032df/instrumentation/net/http/otelhttp/handler.go#L63-L65
out of the box adds labels

  • http.user_agent
  • http.method

that have unbound cardinality. It leads to the server's potential memory exhaustion when many malicious requests are sent to it.

Details

HTTP header User-Agent or HTTP method for requests can be easily set by an attacker to be random and long. The library internally uses httpconv.ServerRequest that records every value for HTTP method and User-Agent.

PoC

Send many requests with long randomly generated HTTP methods or/and User agents (e.g. a million) and observe how memory consumption increases during it.

Impact

In order to be affected, the program has to configure a metrics pipeline, use otelhttp.NewHandler wrapper, and does not filter any unknown HTTP methods or User agents on the level of CDN, LB, previous middleware, etc.

Others

It is similar to already reported vulnerabilities

Workaround for affected versions

As a workaround to stop being affected otelhttp.WithFilter() can be used, but it requires manual careful configuration to not log certain requests entirely.

For convenience and safe usage of this library, it should by default mark with the label unknown non-standard HTTP methods and User agents to show that such requests were made but do not increase cardinality. In case someone wants to stay with the current behavior, library API should allow to enable it.

The other possibility is to disable HTTP metrics instrumentation by passing otelhttp.WithMeterProvider option with noop.NewMeterProvider.

Solution provided by upgrading

In PR https://github.com/open-telemetry/opentelemetry-go-contrib/pull/4277, released with package version 0.44.0, the values collected for attribute http.request.method were changed to be restricted to a set of well-known values and other high cardinality attributes were removed.

References

Severity

  • CVSS Score: 7.5 / 10 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).


Memory exhaustion in go.opentelemetry.io/contrib/instrumentation

CGA-h2vq-f2rf-jwrq / CVE-2023-45142 / GHSA-rcjv-mgp8-qvmr / GO-2023-2113

More information

Details

Memory exhaustion in go.opentelemetry.io/contrib/instrumentation

Severity

Unknown

References

This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).


Configuration

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Need help?

You can ask for more help in the following Slack channel: #proj-renovate-self-hosted. In that channel you can also find ADR and FAQ docs in the Resources section.

@renovate-sh-app renovate-sh-app bot requested a review from a team as a code owner November 27, 2025 10:45
@renovate-sh-app renovate-sh-app bot force-pushed the renovate/go-go.opentelemetry.io-contrib-instrumentation-net-http-otelhttp-vulnerability branch from c00a5b6 to fb80eb4 Compare November 27, 2025 12:40
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ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

  • 3 additional dependencies were updated

Details:

Package Change
go.opentelemetry.io/otel v1.16.0 -> v1.18.0
go.opentelemetry.io/otel/metric v1.16.0 -> v1.18.0
go.opentelemetry.io/otel/trace v1.16.0 -> v1.18.0

@renovate-sh-app renovate-sh-app bot force-pushed the renovate/go-go.opentelemetry.io-contrib-instrumentation-net-http-otelhttp-vulnerability branch 2 times, most recently from 609b486 to 46cbbb3 Compare November 27, 2025 18:34
…n/net/http/otelhttp to v0.44.0 [security]

| datasource | package                                                       | from    | to      |
| ---------- | ------------------------------------------------------------- | ------- | ------- |
| go         | go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp | v0.42.0 | v0.44.0 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>
@renovate-sh-app renovate-sh-app bot force-pushed the renovate/go-go.opentelemetry.io-contrib-instrumentation-net-http-otelhttp-vulnerability branch from 46cbbb3 to 3f9d4d1 Compare November 27, 2025 21:29
@renovate-sh-app renovate-sh-app bot merged commit c72e1a0 into main Nov 28, 2025
8 checks passed
@renovate-sh-app renovate-sh-app bot deleted the renovate/go-go.opentelemetry.io-contrib-instrumentation-net-http-otelhttp-vulnerability branch November 28, 2025 00:27
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