7.5

CVE-2026-8609: Pre-authentication denial of service via the OAuth login route

Analyzed
AliasesALPINE-CVE-2026-8609
Published 10-07-2026Last modified 27-08-2026

Vulnerability summary

CVE-2026-8609 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in grafana. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.40%
0%100%
Low · -0.08 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 4
OPENSUSE-SU-2026:11619-1OPENSUSE-SU-2026:22125-1RHSA-2026:54178RHSA-2026:63164RHSA-2026:63165RHSA-2026:65157

Timeline

  1. 10-07-2026
    PublishedVulnerability first disclosed.
  2. 27-08-2026
    Last modifiedVulnerability information updated.

Description

An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values, causing unbounded memory growth that can eventually exhaust memory and crash the Grafana instance (denial of service).

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

Decrease -0.08 pp

From 0.48% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Grafana2 products
  • grafana≥ 11.6.0, < 11.6.15 | ≥ 12.2.0, < 12.2.9 | ≥ 12.3.0, < 12.3.7 | ≥ 12.4.0, < 12.4.4 | ≥ 13.0.0, < 13.0.2
  • grafana oss≥ 11.6.0, ≤ 11.6.14 | ≥ 12.2.0, ≤ 12.2.8 | ≥ 12.3.0, ≤ 12.3.6 | ≥ 12.4.0, ≤ 12.4.3 | ≥ 13.0.0, ≤ 13.0.1
Alpine1 product
  • grafana≥ 11.6.0, < 12.4.4-r0

2 vendors · 3 products

References

2 links