CVE-2026-42154
Prometheus: remote read endpoint allows denial of service via crafted snappy payload
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.
INFO
Published Date :
May 4, 2026, 7:16 p.m.
Last Modified :
May 11, 2026, 5:22 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Prometheus to version 3.5.3 or later.
- Update Prometheus to version 3.11.3 or later.
Public PoC/Exploit Available at Github
CVE-2026-42154 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42154.
| URL | Resource |
|---|---|
| https://github.com/prometheus/prometheus/pull/18584 | Issue Tracking Patch |
| https://github.com/prometheus/prometheus/pull/18585 | Issue Tracking Patch |
| https://github.com/prometheus/prometheus/releases/tag/v3.11.3 | Release Notes |
| https://github.com/prometheus/prometheus/releases/tag/v3.5.3 | Release Notes |
| https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42154 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42154
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
# CVE-2026-42154 — Prometheus Remote Read Snappy DoS
Security Researcher & Penetration Tester
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42154 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42154 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 11, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:* versions up to (excluding) 3.5.3 *cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 3.11.3 Added Reference Type GitHub, Inc.: https://github.com/prometheus/prometheus/pull/18584 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/prometheus/prometheus/pull/18585 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/prometheus/prometheus/releases/tag/v3.11.3 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/prometheus/prometheus/releases/tag/v3.5.3 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm Types: Vendor Advisory -
New CVE Received by [email protected]
May. 04, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added CWE CWE-789 Added Reference https://github.com/prometheus/prometheus/pull/18584 Added Reference https://github.com/prometheus/prometheus/pull/18585 Added Reference https://github.com/prometheus/prometheus/releases/tag/v3.11.3 Added Reference https://github.com/prometheus/prometheus/releases/tag/v3.5.3 Added Reference https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm