NetSight
IP …
high7.5

CVE-2026-42154

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

Impact

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.

Affected packages

EcosystemPackageAffectedFixed in
gogithub.com/prometheus/prometheus>= 0.306.0, < 0.311.30.311.3

Affected products

VendorProductAffected versions
PrometheusPrometheus
before 3.5.3
from 3.6.0 before 3.11.3

Weakness classification

CWE-400CWE-789CWE-770

References