CVE-2026-42154
Last modified
CVE-2026-42154 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.81% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Prometheus | Prometheus | < 3.5.3 |
| Prometheus | Prometheus | >= 3.6.0, < 3.11.3 |
References
- https://github.com/prometheus/prometheus/pull/18584Issue Tracking, Patch
- https://github.com/prometheus/prometheus/pull/18585Issue Tracking, Patch
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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