Vulnerability Report

CVE-2026-42154

Title: Memory Exhaustion via Remote Read Endpoint

DoS

Proof Of Concept

PoC Available for CVE-2026-42154

CWE Category CWE-400
Published Date May 04, 2026
Modified Date May 11, 2026
Exploit Status Available
Score 7.5 CVSS v3.1
Exploit Probability (EPSS)
0.56%

Vulnerability Summary

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 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.

Impacted Vendors

J
jason_orcutt 1
P
prometheus 1

Reference Links

https://github.com/prometheus/prometheus/pull/18584 https://github.com/prometheus/prometheus/pull/18585 https://github.com/prometheus/prometheus/releases/tag/v3.11.3 https://github.com/prometheus/prometheus/releases/tag/v3.5.3 https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-42154 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/ShadowByte1/CVE-2026-42154
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.