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CVE-2026-42154— Prometheus: remote read endpoint allows denial of service via crafted snappy payload

Quick assessment

Affected
prometheus prometheus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Prometheus是Prometheus开源的一款使用Go语言编写的、用于记录使用HTTP拉模型构建的时间序列数据库中实时指标的开源软件。 Prometheus 3.5.3之前版本和3.11.3之前版本存在资源管理错误漏洞，该漏洞源于远程读取端点未验证snappy压缩请求体中声明的解码长度，可能导致未认证攻击者发送小有效载荷造成大量堆分配并耗尽内存。

CVSS 7.5 · High EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
prometheus prometheus < 3.5.3 affected
>= 3.6.0, < 3.11.3 affected
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I. Basic Information for CVE-2026-42154

Vulnerability Information
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Vulnerability Title
Prometheus: remote read endpoint allows denial of service via crafted snappy payload
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Prometheus 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Prometheus是Prometheus开源的一款使用Go语言编写的、用于记录使用HTTP拉模型构建的时间序列数据库中实时指标的开源软件。 Prometheus 3.5.3之前版本和3.11.3之前版本存在资源管理错误漏洞，该漏洞源于远程读取端点未验证snappy压缩请求体中声明的解码长度，可能导致未认证攻击者发送小有效载荷造成大量堆分配并耗尽内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
prometheus prometheus < 3.5.3 -

II. Public POCs for CVE-2026-42154

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III. Intelligence Information for CVE-2026-42154

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Patches & Fixes for CVE-2026-42154 (2)

Vendor Advisories for CVE-2026-42154 (1)

Vendor Pages for CVE-2026-42154 (2)

IV. Related Vulnerabilities

Same product: prometheus
Same vendor: prometheus
Same weakness: CWE-400

V. Comments for CVE-2026-42154

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