Skip to content
Fencer Vulns
high 7.5

CVE-2026-42154 json

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

published 2026-05-04 6 mo ago modified 2026-09-10 1 mo ago also BIT-prometheus-2026-42154 , EUVD-2026-27091 , GHSA-8rm2-7qqf-34qm , GO-2026-5264

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/prometheus/prometheus 0.305.2, 0.311.3
  • bitnami prometheus 0.305.3, 0.311.3, 3.5.3, 3.11.3
  • Red Hat Red Hat Enterprise Linux 10 0:0.152.1-1.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:0.152.1-1.el10_0
  • Red Hat Red Hat Enterprise Linux 9 0:0.152.1-1.el9_8
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:0.152.1-1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:0.152.1-1.el9_6
  • Red Hat RHEM 1.0 for RHEL 9 0:1.0.3-1.el9em
  • Red Hat RHEM 1.1 for RHEL 10 0:1.1.3-1.el10em
  • Red Hat RHEM 1.1 for RHEL 9 0:1.1.3-1.el9em
  • Red Hat Logging for Red Hat OpenShift 6 1785418852, 1785418855, 1785418915
  • Red Hat Logging for Red Hat OpenShift 6.2 1784747815, 1784747816, 1784747884
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4 1782405469
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.5 1786645109, 1786645114, 1786645138
  • Red Hat Multicluster Global Hub 1.4.5 1784060681
  • Red Hat Multicluster Global Hub 1.6.5 1784561376
  • Red Hat Multicluster Global Hub 1.7.0 1784906628, 1785442872
  • Red Hat OpenShift File Integrity Operator - FIO 1 1786439449
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 1782374537
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1787230287
  • Red Hat Red Hat Edge Manager 1.0 1783502022, 1783502023, 1783502025, 1783502029, 1783502401, 1783502403, 1783502445, 1783502465, 1783502494
  • Red Hat Red Hat Edge Manager 1.1 1784126762, 1784126774, 1784126780, 1784126832, 1784127762, 1784127787, 1784127791, 1784128388, 1784128860, 1784194144, 1784194188, 1784194309, 1784194347, 1784194353, 1784194638, 1784194653, 1784194971, 1784194980, 1784195620, 1784196588
  • Red Hat Red Hat Hardened Images 0.153.0-1.hum1, 0.155.0-0.1.hum1, 2.19.0-1.hum1
  • Red Hat Red Hat multicluster global hub 1.5.3 1784562060
  • Red Hat Red Hat OpenShift Container Platform 4.12 1787343838
  • Red Hat Red Hat OpenShift Container Platform 4.14 1786999821
  • Red Hat Red Hat OpenShift Container Platform 4.15 1786998274
  • Red Hat Red Hat OpenShift Container Platform 4.16 1785582559
  • Red Hat Red Hat OpenShift Container Platform 4.17 1784828871
  • Red Hat Red Hat OpenShift Container Platform 4.18 1785360067
  • prometheus Debian 14 3.5.3+ds1-1

debian advisories DEBIAN-CVE-2026-42154

  • flightctl edge manager 1.1 1.1.3-1.el10em
  • flightctl edge manager 1.1 1.1.3-1.el9em
  • flightctl-cli edge manager 1.1 1.1.3-1.el10em
  • flightctl-cli edge manager 1.1 1.1.3-1.el9em
  • flightctl-agent edge manager 1.1 1.1.3-1.el10em
  • flightctl-agent edge manager 1.1 1.1.3-1.el9em
  • flightctl edge manager 1.0 1.0.3-1.el9em
  • flightctl-cli edge manager 1.0 1.0.3-1.el9em

red hat advisories RHSA-2026:53415RHSA-2026:53412RHSA-2026:53413RHSA-2026:41019RHSA-2026:36796RHSA-2026:34359

  • uyuni-tools Multi-Linux Manager Server Extension for SLE 5.1, Multi-Linux Manager Proxy Extension for SLE 5.1 5.1.29-150700.3.26.1
  • suse-multi-linux-manager-5.1-s390x-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-x86_64-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-aarch64-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-ppc64le-server-image Multi-Linux Manager Server Extension for SLE 5.1 5.1.4-8.20.34
  • suse-multi-linux-manager-5.1-s390x-proxy-ssh-image Multi-Linux Manager Proxy Extension for SLE 5.1 5.1.4-8.20.12
  • suse-multi-linux-manager-5.1-x86_64-proxy-ssh-image Multi-Linux Manager Proxy Extension for SLE 5.1 5.1.4-8.20.12
  • suse-multi-linux-manager-5.1-aarch64-proxy-ssh-image Multi-Linux Manager Proxy Extension for SLE 5.1 5.1.4-8.20.12

suse advisories SUSE-SU-2026:2774-1SUSE-SU-2026:2768-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • golang-github-prometheus-prometheus openSUSE Tumbleweed 3.11.3-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:10676-1

  • opentelemetry-collector AlmaLinux 10 0.152.1-1.el10_2
  • opentelemetry-collector AlmaLinux 9 0.152.1-1.el9_8

almalinux advisories ALSA-2026:34357ALSA-2026:34359

  • opentelemetry-collector Rocky Linux 10 0.152.1-1.el10_2
  • opentelemetry-collector Rocky Linux 9 0.152.1-1.el9_8

rocky linux advisories RLSA-2026:34357RLSA-2026:34359

  • prometheus Alpine 3.24, Alpine 3.23 3.5.3-r0

alpine advisories ALPINE-CVE-2026-42154

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • telegraf Azure Linux 3.0 1.31.0-22

azure linux advisories AZL-86607

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-42154 updated cvss 7.5

github.com/prometheus/prometheus: Prometheus: Denial of Service via uncontrolled memory allocation in remote read endpoint

  • Red Hat File Integrity Operator compliance/openshift-file-integrity-operator-bundle Red Hat OpenShift Lightspeed openshift-lightspeed/openshift-mcp-server-rhel9
    affected: workaround, no fix available
  • Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-promtail-rhel9, rhceph/rhceph-6-dashboard-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9, rhceph/rhceph-promtail-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9, rhceph/rhceph-promtail-rhel9 Red Hat Ceph Storage 9 rhceph/grafana-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-llm-d-routing-sidecar-rhel9, rhoai/odh-llm-d-inference-scheduler-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Container Platform 4 microshift, microshift-olm, microshift-sriov, microshift-multus, microshift-selinux, microshift-greenboot, +17 more Red Hat OpenShift Container Platform 5 microshift, openshift5/ose-prometheus-rhel9, openshift5/microshift-bootc-rhel9 Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.0 openshift-logging/logging-loki-rhel9 1791500729, openshift-logging/loki-rhel9-operator 1785418915, openshift-logging/opa-openshift-rhel9 1785418852, openshift-logging/lokistack-gateway-rhel9 1785418855
    fixed: vendor fix RHSA-2026:83013
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.2 openshift-logging/loki-rhel9-operator 1784747884, openshift-logging/opa-openshift-rhel9 1784747815, openshift-logging/lokistack-gateway-rhel9 1784747816
    fixed: vendor fix RHSA-2026:47952
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4 openshift-logging/logging-loki-rhel9 1782405469, openshift-logging/loki-rhel9-operator 1790704426, openshift-logging/opa-openshift-rhel9 1790704462, openshift-logging/lokistack-gateway-rhel9 1790704519
    fixed: vendor fix RHSA-2026:34364
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.5 openshift-logging/logging-loki-rhel9 1789736915, openshift-logging/loki-rhel9-operator 1786645138, openshift-logging/opa-openshift-rhel9 1786645109, openshift-logging/lokistack-gateway-rhel9 1786645114
    fixed: vendor fix RHSA-2026:70870
show 25 more
  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1784060681
    fixed: vendor fix RHSA-2026:41030
  • Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1784562060
    fixed: vendor fix RHSA-2026:42852
  • Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1784561376
    fixed: vendor fix RHSA-2026:44622
  • Red Hat Multicluster Global Hub 1.7.4 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1784906628, multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1785442872
    fixed: vendor fix RHSA-2026:47149
  • Red Hat OpenShift File Integrity Operator - FIO 1 compliance/openshift-file-integrity-rhel8-operator 1786439449
    fixed: vendor fix RHSA-2026:54288
  • Red Hat Advanced Cluster Management for Kubernetes 2.11 rhacm2/prometheus-rhel9 1788951176
    fixed: vendor fix RHSA-2026:67538
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/prometheus-rhel9 1782374537
    fixed: vendor fix RHSA-2026:30651
  • Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/prometheus-rhel9 1788941108
    fixed: vendor fix RHSA-2026:67539
  • Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2/prometheus-rhel9 1788943695
    fixed: vendor fix RHSA-2026:67541
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/prometheus-rhel9 1788941293
    fixed: vendor fix RHSA-2026:67542
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/prometheus-rhel9 1787230287
    fixed: vendor fix RHSA-2026:60386
  • Red Hat Edge Manager 1.0 rhem/flightctl-api-rhel9 1783502025, rhem/flightctl-worker-rhel9 1783502445, rhem/flightctl-db-setup-rhel9 1783502401, rhem/flightctl-periodic-rhel9 1783502022, rhem/flightctl-pam-issuer-rhel9 1783502403, rhem/flightctl-cli-artifacts-rhel9 1783502494, +4 more
    fixed: vendor fix RHSA-2026:36651
  • Red Hat Edge Manager 1.1 rhem/flightctl-api-rhel9 1784126780, rhem/flightctl-api-rhel10 1784196588, rhem/flightctl-worker-rhel9 1784127775, rhem/flightctl-worker-rhel10 1784194971, rhem/flightctl-db-setup-rhel9 1784126762, rhem/flightctl-periodic-rhel9 1784127791, +18 more
    fixed: vendor fix RHSA-2026:40945
  • Red Hat Enterprise Linux AppStream (v. 9) opentelemetry-collector 0.152.1-1.el9_8
    fixed: vendor fix RHSA-2026:34359
  • Red Hat Enterprise Linux AppStream (v. 10) opentelemetry-collector 0.152.1-1.el10_2
    fixed: vendor fix RHSA-2026:34357
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) opentelemetry-collector 0.152.1-1.el9_4
    fixed: vendor fix RHSA-2026:53412
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) opentelemetry-collector 0.152.1-1.el10_0
    fixed: vendor fix RHSA-2026:53413
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) opentelemetry-collector 0.152.1-1.el9_6
    fixed: vendor fix RHSA-2026:53415
  • Red Hat Hardened Images jaeger 2.19.0-1.hum1, opentelemetry-collector 0.153.0-1.hum1, opentelemetry-collector-contrib 0.155.0-0.1.hum1
    fixed: vendor fix RHSA-2026:25039
  • Red Hat OpenShift Container Platform 4.12 openshift4/ose-prometheus 1787343838
    fixed: vendor fix RHSA-2026:59833
  • Red Hat OpenShift Container Platform 4.13 openshift4/ose-prometheus 1788844232
    fixed: vendor fix RHSA-2026:65840
  • Red Hat OpenShift Container Platform 4.14 openshift4/ose-prometheus 1786999821
    fixed: vendor fix RHSA-2026:56789
  • Red Hat OpenShift Container Platform 4.15 openshift4/ose-prometheus 1786998274
    fixed: vendor fix RHSA-2026:56912
  • Red Hat OpenShift Container Platform 4.16 openshift4/ose-prometheus-rhel9 1785582559
    fixed: vendor fix RHSA-2026:50758
  • Red Hat OpenShift Container Platform 4.17 openshift4/ose-prometheus-rhel9 1784828871
    fixed: vendor fix RHSA-2026:47728

16 more fixed, 58 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.81% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/prometheus/prometheus
>=0.306.0, <0.311.3
<0.305.2
>=1.0.0-rc.0, <=2.5.0
>=1.0.0-rc.0
0.311.3
0.305.2
bitnami prometheus
<0.305.3
>=0.306.0, <0.311.3
>=1.0.0, <3.5.3
>=3.6.0, <3.11.3
0.305.3
0.311.3
3.5.3
3.11.3
go github.com/prometheus/prometheus/v2
all versions
 no fix listed

Affected products

  • prometheus prometheus
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat RHEM 1.0 for RHEL 9
  • Red Hat RHEM 1.1 for RHEL 10
  • Red Hat RHEM 1.1 for RHEL 9
  • Red Hat Logging for Red Hat OpenShift 6
  • Red Hat Logging for Red Hat OpenShift 6.2
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.4
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.5
  • Red Hat Multicluster Global Hub 1.4.5
  • Red Hat Multicluster Global Hub 1.6.5
  • Red Hat Multicluster Global Hub 1.7.0
  • Red Hat OpenShift File Integrity Operator - FIO 1
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17
  • Red Hat Red Hat Edge Manager 1.0
  • Red Hat Red Hat Edge Manager 1.1
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat multicluster global hub 1.5.3
  • Red Hat Red Hat OpenShift Container Platform 4.12
  • Red Hat Red Hat OpenShift Container Platform 4.14
  • Red Hat Red Hat OpenShift Container Platform 4.15
  • Red Hat Red Hat OpenShift Container Platform 4.16
  • Red Hat Red Hat OpenShift Container Platform 4.17
  • Red Hat Red Hat OpenShift Container Platform 4.18
  • Red Hat Red Hat OpenShift Container Platform 4.19
  • Red Hat Red Hat OpenShift Container Platform 4.20
  • Red Hat Red Hat OpenShift Container Platform 4.21
  • Red Hat Red Hat OpenShift Container Platform 4.22
  • Red Hat Red Hat Quay 3.10
  • Red Hat Red Hat Quay 3.12
  • Red Hat Red Hat Quay 3.15
  • Red Hat Red Hat Quay 3.16
  • Red Hat Red Hat Quay 3.9
  • Red Hat Red Hat Trusted Artifact Signer 1.3
  • Red Hat File Integrity Operator
  • Red Hat Network Observability Operator
  • Red Hat OpenShift Lightspeed
  • Red Hat OpenShift Service Mesh 2
  • Red Hat OpenShift Service Mesh 3
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Red Hat Ceph Storage 5
  • Red Hat Red Hat Ceph Storage 6
  • Red Hat Red Hat Ceph Storage 7
  • Red Hat Red Hat Ceph Storage 8
  • Red Hat Red Hat Ceph Storage 9

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-789 Memory Allocation with Excessive Size Value
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Support weird prometheus go-module version nonsense.