CVE-2026-42154

Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, 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. This issue has been patched in versions 3.5.3 and 3.11.3.

The following products are affected by CVE-2026-42154 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-42154.

URL	Resource
https://github.com/prometheus/prometheus/pull/18584
https://github.com/prometheus/prometheus/pull/18585
https://github.com/prometheus/prometheus/releases/tag/v3.11.3
https://github.com/prometheus/prometheus/releases/tag/v3.5.3
https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm