CVE-2026-42154
Prometheus: remote read endpoint allows denial of service via crafted snappy payload
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 CWE-789 |
| Vendor | prometheus |
| Product | prometheus |
| Ecosystems | |
| Industries | Technology |
| Published | May 4, 2026 |
| Last Updated | May 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
prometheus / prometheus
< 3.5.3 >= 3.6.0, < 3.11.3
References
github.com: https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm github.com: https://github.com/prometheus/prometheus/pull/18584 github.com: https://github.com/prometheus/prometheus/pull/18585 github.com: https://github.com/prometheus/prometheus/releases/tag/v3.11.3 github.com: https://github.com/prometheus/prometheus/releases/tag/v3.5.3