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CVE-2026-42154

high

Prometheus is an open-source monitoring system and time series database.

Vendor / product: Prometheus — prometheus

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
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-05-04 19:16
Modified: 2026-11-11 23:10
NVD status: Modified
Last synced 3 hours ago
Verified against the source API 2026-11-11 23:13 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

prometheus / prometheus <3.5.3, ≥3.6.0 <3.11.3

Weakness classification (CWE)

CWE-400 CWE-789 CWE-770

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm
Patch / mitigation: https://github.com/prometheus/prometheus/pull/18584
Patch / mitigation: https://github.com/prometheus/prometheus/pull/18585

References

Data sources

NVD CVE API 2.0 — fetched 2026-11-11 23:13 UTC · record ↗

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