CVE-2026-42154
Prometheus: remote read endpoint allows denial of service via crafted snappy payload
CVSS Score
7.5
EPSS Score
0.8%
EPSS Percentile
53th
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 | Aug 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 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-42154 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2466505 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42154.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41019 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36796 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34357 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34359 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:47952 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34364 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:42852 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:47149 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:30651 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36651 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40945 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40118 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25039 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:29770 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25245 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:44235 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40792 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:34794 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:44263 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:42146 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:43052 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:42796 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41066 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41031 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40262 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40974 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40970 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:40972 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:41030 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:44622