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High severity7.5NVD Advisory· Published May 4, 2026· Updated Aug 14, 2026

CVE-2026-42154

CVE-2026-42154

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/prometheus/prometheusGo
>= 0.306.0, < 0.311.30.311.3
github.com/prometheus/prometheusGo
< 0.305.20.305.2
github.com/prometheus/prometheusGo
>= 1.0.0-rc.0, <= 2.5.0—

Affected products

294

Patches

Vulnerability mechanics

References

49

News mentions

1