CVE-2026-42154

highpriority · track · 10EPSS 0.008 · 57 %ileexploit · PoCDEEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.81% (57th) EPSS

CVSS 7.5 · high

Is it mine?

27 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-26

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400USCWE-770USCWE-789USCWE-789US

exploits (1)

Public proof-of-concept and weaponised exploit code.

ShadowByte1/CVE-2026-42154# CVE-2026-42154 — Prometheus Remote Read Snappy DoSPoC · poc_in_github

affected products (27)

Products and version ranges known to be affected.

Microsoft Azure Linux azl3all versionscert_bundDEcpe:/o:microsoft:azure_linux:azl3
RESF Rocky Linuxall versionscert_bundDEcpe:/o:resf:rocky_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat OpenShift Container Platformall versionscert_bundDEcpe:/a:redhat:openshift:container_platform
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Open Source Open Source Prometheus <3.11.3< 3.11.3cert_bundDE
Open Source Open Source Prometheus <3.5.3< 3.5.3cert_bundDE
Open Source Open Source Prometheus >=2.49.0≥ 2.49.0cert_bundDE
Open Source Prometheus< 3.11.3cert_bundDE
Open Source Prometheus< 3.5.3cert_bundDE
Open Source Prometheus≥ 2.49.0cert_bundDE
Red Hat OpenShift≤ Container Platform <4.22.4cert_bundDE
Red Hat Red Hat OpenShift Container Platform <4.22.4≤ Container Platform <4.22.4cert_bundDE
prometheus prometheus≤ < 3.5.3enisa_euvdEU
prometheus prometheus3.6.0, → 3.11.3enisa_euvdEU
prometheus prometheus< 3.5.3nvdUScpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*
prometheus prometheus3.6.0 → 3.11.3nvdUScpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*
Bitnami prometheus< 0.305.3osvUSpkg:bitnami/prometheus
Bitnami prometheus0.306.0 → 0.311.3osvUSpkg:bitnami/prometheus

showing 20 of 27

advisories (5)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1292Prometheus: Mehrere SchwachstellenDeutsch2026-04-27csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Prometheus ausnutzen, um einen Denial of Service Angriff durchzuführen, vertrauliche Informationen offenzulegen oder Cross-Site-Scripting-Angriffe durchzuführen.
WID-SEC-W-2026-3046IBM Concert: Mehrere SchwachstellenDeutsch2026-08-26csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in IBM Concert ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, um einen SQL-Injection Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.
GHSA-8rm2-7qqf-34qmPrometheus: Remote read endpoint allows denial of service via crafted snappy payload2026-05-05ghsa · osvUS
### Impact 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. ### Patches _Has the problem been patched? What versions should users upgrade to?_ Fixed in 3.11.3 and 3.5.3 LTS. Users should upgrade to these versions or later. ### Workarounds User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read.
BIT-prometheus-2026-42154Prometheus: remote read endpoint allows denial of service via crafted snappy payload2026-07-14vendor · osvUS
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.
GO-2026-5264Prometheus: Remote read endpoint allows denial of service via crafted snappy payload in github.com/prometheus/prometheus2026-06-25vendor · osvUS
Prometheus: Remote read endpoint allows denial of service via crafted snappy payload in github.com/prometheus/prometheus

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund nvd NVD CVE.org MITRE

published 2026-05-04modified 2026-09-10

references (59)

External citations — patches, advisories, analysis.

scry

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