Prometheus: remote read endpoint allows denial of service via crafted snappy payload
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 45 fixed, 11 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| prometheus | prometheus | before 3.5.3; 3.6.0 to before 3.11.3 | 3.5.3, 3.11.3 | Patch available | CNA |
| — | github.com/prometheus/prometheus (Go) | 0.306.0 to before 0.311.3 | 0.311.3 | Patch available | GHSA-8rm2-7qqf-34qm |
| — | github.com/prometheus/prometheus (Go) | before 0.305.2 | 0.305.2 | Patch available | GHSA-8rm2-7qqf-34qm |
| — | github.com/prometheus/prometheus (Go) | 1.0.0-rc.0 – 2.5.0 | — | No fix listed | GHSA-8rm2-7qqf-34qm |
- prometheus Vendorprometheus Affected before 3.5.3; 3.6.0 to before 3.11.3 Fixed in 3.5.3, 3.11.3 Patch available CNA
- github.com/prometheus/prometheus (Go) Vendor— Affected 0.306.0 to before 0.311.3 Fixed in 0.311.3 Patch available GHSA-8rm2-7qqf-34qm
- github.com/prometheus/prometheus (Go) Vendor— Affected before 0.305.2 Fixed in 0.305.2 Patch available GHSA-8rm2-7qqf-34qm
- github.com/prometheus/prometheus (Go) Vendor— Affected 1.0.0-rc.0 – 2.5.0 Fixed in — No fix listed GHSA-8rm2-7qqf-34qm
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:* | before 3.5.3; 3.6.0 to before 3.11.3 | Vulnerable | prometheus |
- cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:* Versions before 3.5.3; 3.6.0 to before 3.11.3 Vulnerable ·prometheus
Remediation
- Fix · CNA prometheus (prometheus) Fixed in 3.5.3, 3.11.3
- Fix · GHSA-8rm2-7qqf-34qm github.com/prometheus/prometheus (Go) Fixed in 0.311.3 Advisory →
- Fix · GHSA-8rm2-7qqf-34qm github.com/prometheus/prometheus (Go) Fixed in 0.305.2 Advisory →
Red Hat 54 advisories
- RHSA-2026:83013 Released 2026-10-14 · Red Hat rating ImportantLogging for Red Hat OpenShift - 6.0.17
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- RHSA-2026:77639 Released 2026-10-07 · Red Hat rating ImportantLogging for Red Hat OpenShift - 6.4.7
- Logging Subsystem for Red Hat OpenShift 6.4 registry.redhat.io/openshift-logging/logging-loki-rhel9, registry.redhat.io/openshift-logging/loki-rhel9-operator, registry.redhat.io/openshift-logging/lokistack-gateway-rhel9 +1
- RHSA-2026:74511 Released 2026-10-01 · Red Hat rating ImportantRed Hat Quay 3.17.5
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- RHSA-2026:25245 Released 2026-06-11 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
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Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| File Integrity Operator | Affected | No fix yet |
| OpenShift Lightspeed | Affected | No fix yet |
| Red Hat Ceph Storage 5 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 6 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 7 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 8 | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat OpenShift GitOps | Affected | No fix yet |
| Logging Subsystem for Red Hat OpenShift 6.0 | Fixed | RHSA-2026:50843, RHSA-2026:83013 |
| Logging Subsystem for Red Hat OpenShift 6.2 | Fixed | RHSA-2026:47952 |
| Logging Subsystem for Red Hat OpenShift 6.4 | Fixed | RHSA-2026:34364, RHSA-2026:77639 |
| Logging Subsystem for Red Hat OpenShift 6.5 | Fixed | RHSA-2026:56340, RHSA-2026:70870 |
| Multicluster Global Hub 1.4.9 | Fixed | RHSA-2026:41030 |
| Multicluster Global Hub 1.5.8 | Fixed | RHSA-2026:42852 |
| Multicluster Global Hub 1.6.6 | Fixed | RHSA-2026:44622 |
| Multicluster Global Hub 1.7.4 | Fixed | RHSA-2026:47149, RHSA-2026:53530 |
| OpenShift File Integrity Operator - FIO 1 | Fixed | RHSA-2026:54288 |
| RHEM 1.0 for RHEL 9 | Fixed | RHSA-2026:36796 |
| RHEM 1.1 for RHEL 10 | Fixed | RHSA-2026:41019 |
| RHEM 1.1 for RHEL 9 | Fixed | RHSA-2026:41019 |
| Red Hat Advanced Cluster Management for Kubernetes 2.11 | Fixed | RHSA-2026:67538 |
| Red Hat Advanced Cluster Management for Kubernetes 2.13 | Fixed | RHSA-2026:30651 |
| Red Hat Advanced Cluster Management for Kubernetes 2.14 | Fixed | RHSA-2026:67539 |
| Red Hat Advanced Cluster Management for Kubernetes 2.15 | Fixed | RHSA-2026:67541 |
| Red Hat Advanced Cluster Management for Kubernetes 2.16 | Fixed | RHSA-2026:67542 |
| Red Hat Advanced Cluster Management for Kubernetes 2.17 | Fixed | RHSA-2026:60386 |
| Red Hat Edge Manager 1.0 | Fixed | RHSA-2026:36651 |
| Red Hat Edge Manager 1.1 | Fixed | RHSA-2026:40118, RHSA-2026:40945 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:34357 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:34359 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:53412 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:53413 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:53415 |
| Red Hat Hardened Images | Fixed | RHSA-2026:25039, RHSA-2026:25245, RHSA-2026:29770 |
| Red Hat OpenShift Container Platform 4.12 | Fixed | RHSA-2026:59833 |
| Red Hat OpenShift Container Platform 4.13 | Fixed | RHSA-2026:65840 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2026:56789 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | RHSA-2026:56912 |
| Red Hat OpenShift Container Platform 4.16 | Fixed | RHSA-2026:50758 |
| Red Hat OpenShift Container Platform 4.17 | Fixed | RHSA-2026:47728 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:48699 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:44235 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:44263 |
| Red Hat OpenShift Container Platform 4.21 | Fixed | RHSA-2026:40792 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:34794 |
| Red Hat Quay 3.10 | Fixed | RHSA-2026:41031 |
| Red Hat Quay 3.12 | Fixed | RHSA-2026:42146, RHSA-2026:43052 |
| Red Hat Quay 3.14 | Fixed | RHSA-2026:70267 |
| Red Hat Quay 3.15 | Fixed | RHSA-2026:42796 |
| Red Hat Quay 3.16 | Fixed | RHSA-2026:41066 |
| Red Hat Quay 3.17 | Fixed | RHSA-2026:74511 |
| Red Hat Quay 3.9 | Fixed | RHSA-2026:40262 |
| Red Hat Trusted Artifact Signer 1.3 | Fixed | RHSA-2026:40970, RHSA-2026:40972, RHSA-2026:40974 |
Not affected: 58 products
- File Integrity Operator
- Logging Subsystem for Red Hat OpenShift 6.0
- Logging Subsystem for Red Hat OpenShift 6.2
- Logging Subsystem for Red Hat OpenShift 6.4
- Logging Subsystem for Red Hat OpenShift 6.5
- Multicluster Global Hub 1.4.9
- Multicluster Global Hub 1.5.8
- Multicluster Global Hub 1.6.6
- Multicluster Global Hub 1.7.4
- Network Observability Operator
- OpenShift File Integrity Operator - FIO 1
- OpenShift Service Mesh 2
- OpenShift Service Mesh 3
- RHEM 1.0 for RHEL 9
- RHEM 1.1 for RHEL 10
- RHEM 1.1 for RHEL 9
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Advanced Cluster Management for Kubernetes 2.11
- Red Hat Advanced Cluster Management for Kubernetes 2.13
- Red Hat Advanced Cluster Management for Kubernetes 2.14
- Red Hat Advanced Cluster Management for Kubernetes 2.15
- Red Hat Advanced Cluster Management for Kubernetes 2.16
- Red Hat Advanced Cluster Management for Kubernetes 2.17
- Red Hat Data Grid 8
- Red Hat Edge Manager 1.0
- Red Hat Edge Manager 1.1
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Hardened Images
- Red Hat JBoss Enterprise Application Platform 8
- Red Hat JBoss Enterprise Application Platform Expansion Pack
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 4.12
- Red Hat OpenShift Container Platform 4.13
- Red Hat OpenShift Container Platform 4.14
- Red Hat OpenShift Container Platform 4.15
- Red Hat OpenShift Container Platform 4.16
- Red Hat OpenShift Container Platform 4.17
- Red Hat OpenShift Container Platform 4.18
- Red Hat OpenShift Container Platform 4.19
- Red Hat OpenShift Container Platform 4.20
- Red Hat OpenShift Container Platform 4.21
- Red Hat OpenShift Container Platform 4.22
- Red Hat OpenShift Container Platform 5
- Red Hat OpenStack Platform 18.0
- Red Hat Quay 3.10
- Red Hat Quay 3.12
- Red Hat Quay 3.14
- Red Hat Quay 3.15
- Red Hat Quay 3.16
- Red Hat Quay 3.17
- Red Hat Quay 3.9
- Red Hat Trusted Artifact Signer 1.3
- Red Hat build of Apache Camel for Spring Boot 4
- Red Hat build of Debezium 3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-42154
- 2026-10-03 Alias added: GHSA-8rm2-7qqf-34qm
- 2026-10-08 Fix available: RHSA-2026:77639 · Red Hat
- 2026-10-08 Affected versions changed · Red Hat
- 2026-10-10 Affected versions changed · Red Hat
- 2026-10-15 Fix available: RHSA-2026:83013 · Red Hat
- 2026-10-16 Fix available: Logging Subsystem for Red Hat OpenShift 6.0 · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-11-06 Fix available: Multicluster Global Hub 1.7.4 · Red Hat
References
Patch 2
Advisory 2
More Prometheus vulnerabilities
- TI-2021-10330 Arbitrary redirects under /new endpoint CVSS 3.1MEDIUM 6.5
- TI-2026-30481 Prometheus Azure AD remote write OAuth client secret exposed via config API CVSS 3.1HIGH 7.5
- TI-2019-02838 Cross-site scripting in [UNKNOWN] prometheus CVSS 3.0MEDIUM 6.1
- TI-2026-28993 Prometheus: Stored XSS via metric names and label values in web UI tooltips and metrics explorer CVSS 4.0MEDIUM 5.3
- TI-2026-32778 Prometheus: Stored XSS via crafted histogram bucket label values in the heatmap display of the old Prometheus web UI CVSS 4.0MEDIUM 5.1
Sources
- CVE-2026-42154 · CVE Program
- CVE-2026-42154 · NVD
- FIRST EPSS
- GHSA-8rm2-7qqf-34qm · GitHub Advisory Database · CC BY 4.0
- CVE-2026-42154 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences