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Vulnerability · Published May 4, 2026 · Assigned by GitHub_M

CVE-2026-42154Prometheus: remote read endpoint allows denial of service via crafted snappy payload

High 7.5

In plain English

A high-severity uncontrolled resource consumption in prometheus from prometheus. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 42.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10opentelemetry-collector0.152.1-1.el10_2ALSA-2026:34357
AlmaLinux:9opentelemetry-collector0.152.1-1.el9_8ALSA-2026:34359
Alpine:v3.23prometheus3.5.3-r0ALPINE-CVE-2026-42154
Alpine:v3.24prometheus3.5.3-r0ALPINE-CVE-2026-42154
Debian:12prometheusno fix listedDEBIAN-CVE-2026-42154
Debian:13prometheusno fix listedDEBIAN-CVE-2026-42154
Debian:14prometheus3.5.3+ds1-1DEBIAN-CVE-2026-42154
Gogithub.com/prometheus/prometheus0.311.3GHSA-8rm2-7qqf-34qm
Gogithub.com/prometheus/prometheus0.305.2GHSA-8rm2-7qqf-34qm
Gogithub.com/prometheus/prometheusno fix listedGHSA-8rm2-7qqf-34qm
Gogithub.com/prometheus/prometheus0.305.2, 0.311.3GO-2026-5264
Gogithub.com/prometheus/prometheus/v2no fix listedGO-2026-5264
Rocky Linux:10opentelemetry-collector0:0.152.1-1.el10_2RLSA-2026:34357
Rocky Linux:9opentelemetry-collector0:0.152.1-1.el9_8RLSA-2026:34359
Ubuntu:25.10prometheusno fix listedUBUNTU-CVE-2026-42154
Ubuntu:26.10prometheusno fix listedUBUNTU-CVE-2026-42154

Affected products (as reported)

VendorProductVersions
prometheus prometheus < 3.5.3>= 3.6.0, < 3.11.3

Weakness: CWE-400, CWE-789, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References