CVE-2025-61726 — Memory exhaustion in query parameter parsing in net/url

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.

GHSA-8rm2-7qqf-34qm — Prometheus: Remote read endpoint allows denial of service via crafted snappy payload

Affected: Go: github.com/prometheus/prometheus

### Impact

The remote read endpoint (`/api/v1/read`) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process.

### Patches _Has the problem been patched? What versions should users upgrade to?_

Fixed in 3.11.3 and 3.5.3 LTS. Users should upgrade to these versions or later.

### Workarounds User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read.

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CVE-2025-61726 — Memory exhaustion in query parameter parsing in net/url

GHSA-8rm2-7qqf-34qm — Prometheus: Remote read endpoint allows denial of service via crafted snappy payload