What is GHSA-8rm2-7qqf-34qm?

GHSA-8rm2-7qqf-34qm is a security advisory published by GitHub Security Advisories with High severity. Prometheus: Remote read endpoint allows denial of service via crafted snappy payload

Which CVE IDs does GHSA-8rm2-7qqf-34qm cover?

GHSA-8rm2-7qqf-34qm covers the following CVE IDs: CVE-2026-42154. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-8rm2-7qqf-34qm?

GHSA-8rm2-7qqf-34qm has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

Which products are affected by GHSA-8rm2-7qqf-34qm?

GHSA-8rm2-7qqf-34qm affects 3 products, including: go/github.com/prometheus/prometheus:\u003e= 0.306.0, \u003c 0.311.3; go/github.com/prometheus/prometheus:\u003c 0.305.2; go/github.com/prometheus/prometheus:\u003e= 1.0.0-rc.0, \u003c= 2.5.0.

GHSA-8rm2-7qqf-34qmHighCVSS 7.5

Prometheus: Remote read endpoint allows denial of service via crafted snappy payload

Vendor

GitHub Security Advisories

Published

May 5, 2026

Last Modified

June 8, 2026

🔗 CVE IDs covered (1)

CVE-2026-42154 →

📋 Description

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.

🎯 Affected products3

go/github.com/prometheus/prometheus:>= 0.306.0, < 0.311.3
go/github.com/prometheus/prometheus:< 0.305.2
go/github.com/prometheus/prometheus:>= 1.0.0-rc.0, <= 2.5.0