Home/CVE/Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote
CVE

CVE-2026-42154

Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote

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.

HIGH · CVSS 7.5 EPSS 0.0002
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-400Uncontrolled Resource Consumption
CWE-789Memory Allocation with Excessive Size Value
▤

Affected Products & Versions

2
prometheus< 3.5.3
prometheus>= 3.6.0 and < 3.11.3
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/prometheus/prometheus HIGH fixed in 0.311.3
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 May 2026 · 07:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
msrcCVE-2026-42154
suse-csafopenSUSE-SU-2026:10676-1
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/prometheus/prometheus/pull/18584Issue TrackingPatch
https://github.com/prometheus/prometheus/pull/18585Issue TrackingPatch
https://github.com/prometheus/prometheus/releases/tag/v3.11.3Release Notes
https://github.com/prometheus/prometheus/releases/tag/v3.5.3Release Notes
https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qmVendor Advisory
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