GHSA-8rm2-7qqf-34qm

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GHSA-8rm2-7qqf-34qm

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

Details: ### 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.

References: https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm, https://nvd.nist.gov/vuln/detail/CVE-2026-42154, https://github.com/prometheus/prometheus/pull/18584, https://github.com/prometheus/prometheus/pull/18585, https://github.com/prometheus/prometheus, https://github.com/prometheus/prometheus/releases/tag/v3.11.3, https://github.com/prometheus/prometheus/releases/tag/v3.5.3