CVE-2026-42154

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.

CVSS Metrics

• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.81%• Percentile: 55%

Techniques & Countermeasures

• CWE-400•Uncontrolled Resource Consumption

  The product does not properly control the allocation and maintenance of a limited resource.

• CWE-789•Memory Allocation with Excessive Size Value

  The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

• CWE-770•Allocation of Resources Without Limits or Throttling

  The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Affected Systems

• chainguard•agentbeat

  < 9.2.7-r16

• chainguard•agentbeat-fips

  < 9.2.7-r15

• chainguard•amazon-cloudwatch-agent

  all

• chainguard•amazon-cloudwatch-agent-fips

  all

• chainguard•amazon-cloudwatch-agent-operator

  < 3.5.0-r4

• chainguard•amazon-cloudwatch-agent-operator-fips

  < 3.5.0-r4

• chainguard•aws-otel-collector

  < 0.49.0-r0

• chainguard•aws-otel-collector-fips

  < 0.49.0-r0

• chainguard•certificate-transparency

  all

• chainguard•certificate-transparency-fips-trillian-ctserver

  < 1.3.3-r14

• chainguard•certificate-transparency-trillian-ctserver

  < 1.3.3-r13

• chainguard•cloud-sql-proxy-2.16

  < 2.16.0-r20

• chainguard•cloud-sql-proxy-2.17

  < 2.17.1-r23

• chainguard•cloud-sql-proxy-2.18

  < 2.18.3-r10

• chainguard•cloud-sql-proxy-2.21

  < 2.21.3-r4

• chainguard•cloud-sql-proxy-2.22

  < 2.22.1-r1

• chainguard•cloud-sql-proxy-2.23

  < 2.23.0-r0

• chainguard•cloud-sql-proxy-fips

  < 2.23.0-r0

• chainguard•cloudzero-collector

  < 1.2.11-r3

• chainguard•cloudzero-collector-fips

  < 1.2.11-r1

• chainguard•cloudzero-regurgitator

  < 1.2.11-r3

• chainguard•cloudzero-regurgitator-fips

  < 1.2.11-r1

• chainguard•cloudzero-shipper

  < 1.2.11-r3

• chainguard•cloudzero-shipper-fips

  < 1.2.11-r1

• chainguard•cloudzero-webhook

  < 1.2.11-r3

• chainguard•cloudzero-webhook-fips

  < 1.2.11-r1

• chainguard•commercial-grafana-11.6

  < 11.6.16-r1

• chainguard•commercial-grafana-12.1

  all

• chainguard•commercial-grafana-12.2

  < 12.2.10-r0

• chainguard•commercial-grafana-12.3

  < 12.3.8-r0

• chainguard•commercial-grafana-12.4

  < 12.4.5-r0

• chainguard•commercial-grafana-13.0

  < 13.0.3-r1

• chainguard•commercial-grafana-13.1

  < 13.1.0-r0

• chainguard•cortex

  all

• chainguard•cortex-fips

  all

• chainguard•cortex-geomys-fips

  all

• chainguard•datadog-agent-7.71-full

  all

• chainguard•datadog-agent-7.72-full

  all

• chainguard•datadog-agent-7.73-full

  all

• chainguard•datadog-agent-7.74-full

  all

• chainguard•datadog-agent-7.75

  all

• chainguard•datadog-agent-7.75-full

  all

• chainguard•datadog-agent-7.76

  all

• chainguard•datadog-agent-7.76-full

  all

• chainguard•datadog-agent-7.77

  < 7.77.3-r21

• chainguard•datadog-agent-7.77-full

  < 7.77.3-r21

• chainguard•datadog-agent-7.78

  < 7.78.4-r15

• chainguard•datadog-agent-7.78-full

  < 7.78.4-r15

• chainguard•datadog-agent-7.79

  < 0

• chainguard•datadog-agent-7.79-full

  < 0

Showing first 50 affected entries in server-rendered view.

References (56)

• https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm
• https://github.com/prometheus/prometheus/pull/18584
• https://github.com/prometheus/prometheus/pull/18585
• https://github.com/prometheus/prometheus/releases/tag/v3.11.3
• https://github.com/prometheus/prometheus/releases/tag/v3.5.3
• https://nvd.nist.gov/vuln/detail/CVE-2026-42154
• https://github.com/prometheus/prometheus
• https://access.redhat.com/security/cve/CVE-2026-42154
• https://bugzilla.redhat.com/show_bug.cgi?id=2466505
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42154.json
• https://access.redhat.com/errata/RHSA-2026:30651
• https://access.redhat.com/errata/RHSA-2026:25039
• https://access.redhat.com/errata/RHSA-2026:29770
• https://access.redhat.com/errata/RHSA-2026:25245
• https://access.redhat.com/errata/RHSA-2026:34357
• https://access.redhat.com/errata/RHSA-2026:34359
• https://access.redhat.com/errata/RHSA-2026:34364
• https://access.redhat.com/errata/RHSA-2026:36796
• https://access.redhat.com/errata/RHSA-2026:36651
• https://access.redhat.com/errata/RHSA-2026:34794
• https://access.redhat.com/errata/RHSA-2026:41019
• https://access.redhat.com/errata/RHSA-2026:41030
• https://access.redhat.com/errata/RHSA-2026:40945
• https://access.redhat.com/errata/RHSA-2026:40118
• https://access.redhat.com/errata/RHSA-2026:41031
• https://access.redhat.com/errata/RHSA-2026:41066
• https://access.redhat.com/errata/RHSA-2026:40262
• https://access.redhat.com/errata/RHSA-2026:40974
• https://access.redhat.com/errata/RHSA-2026:40970
• https://access.redhat.com/errata/RHSA-2026:40972
• https://access.redhat.com/errata/RHSA-2026:40792
• https://access.redhat.com/errata/RHSA-2026:42146
• https://access.redhat.com/errata/RHSA-2026:42852
• https://access.redhat.com/errata/RHSA-2026:42796
• https://access.redhat.com/errata/RHSA-2026:53413
• https://access.redhat.com/errata/RHSA-2026:53412
• https://access.redhat.com/errata/RHSA-2026:53415
• https://access.redhat.com/errata/RHSA-2026:50843
• https://access.redhat.com/errata/RHSA-2026:47952
• https://access.redhat.com/errata/RHSA-2026:47149
• https://access.redhat.com/errata/RHSA-2026:53530
• https://access.redhat.com/errata/RHSA-2026:47728
• https://access.redhat.com/errata/RHSA-2026:48699
• https://access.redhat.com/errata/RHSA-2026:44235
• https://access.redhat.com/errata/RHSA-2026:44263
• https://access.redhat.com/errata/RHSA-2026:43052
• https://access.redhat.com/errata/RHSA-2026:44622
• https://access.redhat.com/errata/RHSA-2026:54288
• https://access.redhat.com/errata/RHSA-2026:50758
• https://security-tracker.debian.org/tracker/CVE-2026-42154
• https://access.redhat.com/errata/RHSA-2026:56340
• https://access.redhat.com/errata/RHSA-2026:56789
• https://access.redhat.com/errata/RHSA-2026:60386
• https://access.redhat.com/errata/RHSA-2026:56912
• https://access.redhat.com/errata/RHSA-2026:59833
• https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42154.json