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Fencer Vulns
medium 6.5

CVE-2026-33374 json

Unbounded memory allocation in the Prometheus rule conversion API

published 2026-10-13 26 d ago modified 2026-10-20 20 d ago also BIT-grafana-2026-33374 , EUVD-2026-98905

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

The Prometheus rule conversion API endpoints in Grafana do not limit request body size, allowing authenticated users to trigger unbounded memory allocations that can crash the server through out-of-memory conditions.

Patch / fix

  • bitnami grafana 12.4.13, 13.0.11, 13.1.8, 13.2.4
  • Grafana Grafana Enterprise 12.4.13, 13.0.11, 13.1.8, 13.2.4
  • Grafana Grafana OSS 12.4.13, 13.0.11, 13.1.8, 13.2.4
  • grafana13.2 hummingbird 1 13.2.4-0.1.hum1
  • grafana12.4 hummingbird 1 12.4.12-0.5.hum1

red hat advisories RHSA-2026:85544RHSA-2026:84422

  • grafana Alpine 3.24 12.4.14-r0

alpine advisories ALPINE-CVE-2026-33374

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33374 updated cvss 6.5

grafana: grafana: Denial of Service via unbounded request body size in Prometheus rule conversion API

  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat Ceph Storage 8 rhceph/grafana-rhel9 Red Hat Ceph Storage 9 rhceph/grafana-rhel10 Red Hat Enterprise Linux 10 grafana
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images grafana13.1 13.1.8-0.3.hum1, grafana13.2 13.2.4-0.1.hum1, grafana12.4 12.4.12-0.5.hum1
    fixed: vendor fix RHSA-2026:84422
  • Red Hat Enterprise Linux 8 grafana, grafana-loki, grafana-mssql, grafana-mysql, grafana-selinux, grafana-graphite, +8 more Red Hat Enterprise Linux 9 grafana, rhel9/grafana, grafana-selinux Red Hat Enterprise Linux 10 rhel10/grafana
    not affected: vulnerable code not present
  • Red Hat Hardened Images hi/grafana
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
26 d ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami grafana
>=12.0.0, <12.4.13
>=13.0.0, <13.0.11
>=13.1.0, <13.1.8
>=13.2.0, <13.2.4
12.4.13
13.0.11
13.1.8
13.2.4

Affected products

  • Grafana Grafana Enterprise
  • Grafana Grafana OSS

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-789 Memory Allocation with Excessive Size Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.