Is github.com/prometheus/prometheus affected by CVE-2026-40179?

Go github.com/prometheus/prometheus is affected in >=3.0.0 =3.6.0 <=3.11.1, <0.311.2-0.20260410083055-07c6232d159b.

Is CVE-2026-40179 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-40179

Q: Is CVE-2026-40179 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

Go · github.com/prometheus/prometheus

Summary

Prometheus has Stored XSS via metric names and label values in Prometheus web UI tooltips and metrics explorer

Severity: medium
EPSS: 0.2% (p15)
Also known as: GHSA-vffh-x6r8-xx99, BIT-prometheus-2026-40179
Published: 2026-04-13

References

https://github.com/prometheus/prometheus/security/advisories/GHSA-vffh-x6r8-xx99
https://nvd.nist.gov/vuln/detail/CVE-2026-40179
https://github.com/prometheus/prometheus/pull/18506

Related advisories

CVE-2026-42154 — high · Go/github.com/prometheus/prometheus
CVE-2026-42151 — high · Go/github.com/prometheus/prometheus
CVE-2026-44903 — medium · Go/github.com/prometheus/prometheus

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.