Affected: Go standard library net/url, Red Hat Cryostat 4 on RHEL 9, Red Hat HawtIO HawtIO 4.3.1, Red Hat HawtIO HawtIO 4.4.0, Red Hat Ansible Automation Platform 2.4 for RHEL 8, Red Hat Ansible Automation Platform 2.4 for RHEL 9, Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 10, Red Hat Ansible Automation Platform 2.6 for RHEL 9 and 152 more

The net/url package does not set a limit on the number of query parameters in a query. While the maximum size of query parameters in URLs is generally limited by the maximum request header size, the net/http.Request.ParseForm method can parse large URL-encoded forms. Parsing a large form containing many unique query parameters can cause excessive memory consumption.

Affected: Go: go.opentelemetry.io/otel

multi-value `baggage:` header extraction parses each header field-value independently and aggregates members across values. this allows an attacker to amplify cpu and allocations by sending many `baggage:` header lines, even when each individual value is within the 8192-byte per-value parse limit.

## severity

HIGH (availability / remote request amplification)

## relevant links

- repository: https://github.com/open-telemetry/opentelemetry-go - pinned callsite: https://github.com/open-telemetry/opentelemetry-go/blob/1ee4a4126dbdd1bc79e9fae072fa488beffac52a/propagation/baggage.go#L58

## vulnerability details

**pins:** open-telemetry/opentelemetry-go@1ee4a4126dbdd1bc79e9fae072fa488beffac52a **as-of:** 2026-02-04 **policy:** direct (no program scope provided)

**callsite:** propagation/baggage.go:58 (`extractMultiBaggage`) **attacker control:** inbound HTTP request headers (many `baggage` field-values) → `propagation.HeaderCarrier.Values("baggage")` → repeated `baggage.Parse` + member aggregation

### root cause

`extractMultiBaggage` iterates over all `baggage` header field-values and parses each one independently, then appends members into a shared slice. the 8192-byte parsing cap applies per header value, but the multi-value path repeats that work once per header line (bounded only by the server/proxy header byte limit).

### impact

in a default `net/http` configuration (max header bytes 1mb), a single request with many `baggage:` header field-values can cause large per…