CVE-2026-42154

HIGH EPSS 42.3%
Published May 4, 20261mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published May 4, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
42.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-400 Uncontrolled Resource Consumption Resource Mgmt
CWE-789

Affected Products 2

VendorProductVersionRange
prometheusprometheus* <3.5.3
prometheusprometheus*≥3.6.0  –  <3.11.3

References 5

  • github.com https://github.com/prometheus/prometheus/pull/18584
    Issue TrackingPatch
  • github.com https://github.com/prometheus/prometheus/pull/18585
    Issue TrackingPatch
  • github.com https://github.com/prometheus/prometheus/releases/tag/v3.11.3
    Release Notes
  • github.com https://github.com/prometheus/prometheus/releases/tag/v3.5.3
    Release Notes
  • github.com https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm
    Vendor Advisory

Remediation

  • github.com https://github.com/prometheus/prometheus/pull/18584
    Issue TrackingPatch
  • github.com https://github.com/prometheus/prometheus/pull/18585
    Issue TrackingPatch