Prometheus: Remote read endpoint allows denial of service via crafted snappy payload

高 7.5CVE-2026-42154 · BIT-prometheus-2026-42154 · GHSA-8rm2-7qqf-34qm · 04/05/2026 公開 · 10/09/2026 更新

要点

CVE-2026-42154 は github.com/prometheus/prometheus, github.com/prometheus/prometheus/v2, prometheus (prometheus) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.81%（全脆弱性の 57.0% より高い）。
対処：0.311.3, 0.305.2, 3.11.3, 3.5.3 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/prometheus/prometheus Go	`≥ 0.306.0, < 0.311.3≥ 1.0.0-rc.0, ≤ 2.5.0≥ 1.0.0-rc.0< 0.305.2`	`0.311.30.305.2`
github.com/prometheus/prometheus/v2 Go	`全バージョン`	修正版なし
prometheus prometheus	`≥ 3.6.0, < 3.11.3< 3.5.3`	`3.11.33.5.3`

概要

Impact

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.

Patches

Has the problem been patched? What versions should users upgrade to?

Fixed in 3.11.3 and 3.5.3 LTS. Users should upgrade to these versions or later.

Workarounds

User who can not upgrade can place Prometheus behind a reverse proxy or firewall that requires authentication before requests reach /api/v1/read.

NVD の説明

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.