CVE-2026-42154
7.5 · HIGHOverview
CVE-2026-42154 is a high-severity vulnerability affecting prometheus prometheus. It was published on May 4, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from prometheus. Update prometheus to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| prometheus | prometheus | >= 0, < 3.5.3 | Affected |
References
Frequently Asked Questions
What is CVE-2026-42154?
CVE-2026-42154 is a high-severity vulnerability affecting prometheus prometheus. It was published on May 4, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-42154?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-42154?
Check the references section for vendor advisories and patches from prometheus. Update prometheus to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-42154?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-42154 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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