# CVE-2026-88858: Server-side expression parser denial of service

Status: published. Published: 2026-10-28. Updated: 2026-11-05.

A user with the Viewer role in Grafana can crash the server by submitting a crafted server-side math expression (uncontrolled recursion). A user with permission to provision alert rules can make the outage persist across restarts.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Grafana / Grafana OSS: ≥ 7.4.0; ≤ 11.6.16 (affected, semver); ≥ 12.0.0; ≤ 12.2.10 (affected, semver); ≥ 12.3.0; ≤ 12.3.11 (affected, semver); ≥ 12.4.0; ≤ 12.4.13 (affected, semver); ≥ 13.0.0; ≤ 13.0.11 (affected, semver); ≥ 13.1.0; ≤ 13.1.8 (affected, semver); ≥ 13.2.0; ≤ 13.2.4 (affected, semver). Source: CNA: GRAFANA
- Grafana / Grafana Enterprise: ≥ 7.4.0; ≤ 11.6.16 (affected, semver); ≥ 12.0.0; ≤ 12.2.10 (affected, semver); ≥ 12.3.0; ≤ 12.3.11 (affected, semver); ≥ 12.4.0; ≤ 12.4.13 (affected, semver); ≥ 13.0.0; ≤ 13.0.11 (affected, semver); ≥ 13.1.0; ≤ 13.1.8 (affected, semver); ≥ 13.2.0; ≤ 13.2.4 (affected, semver). Source: CNA: GRAFANA

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: GRAFANA

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-05; percentile 27.52%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-674, CWE-20, CWE-400

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://grafana.com/security/security-advisories/cve-2026-88858 (CNA: GRAFANA; vendor-advisory)

## Provenance

- CNA: GRAFANA: https://www.cve.org/CVERecord?id=CVE-2026-88858; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-88858; retrieved 2026-11-05; source updated Not reported

Revision: c633a7c756d82525f949965394f6ab90a327bb015c09a8e12a684135ecbfc8ce

Canonical: https://y2.dev/cve/CVE-2026-88858

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