prometheus: Prometheus is an open-source monitoring system and time series database
CVE-2026-44903 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-44903, released May 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Prometheus is an open-source monitoring system and time series database. From 2.49.0 to before 3.5.3 and 3.11.3, in the Prometheus server's legacy web UI (enabled via the command-line flag --enable-feature=old-ui), the histogram heatmap chart view does not escape le label values when inserting them into the HTML for use as axis tick mark labels. An attacker who can inject crafted metrics can execute JavaScript in the browser of any Prometheus user who views the metric in the heatmap chart UI. This vulnerability is fixed in 3.5.3 and 3.11.3.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| govulncheck-vulndb · opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | OPENSUSE-SU-2026:21483-1 | Jul 30, 2026 |
| prometheus · Debian 14 | 3.5.3+ds1-1 | DEBIAN-CVE-2026-44903 | May 26, 2026 |
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