VYPR
← All advisories
Medium severity6.1GHSA Advisory· Published May 26, 2026· Updated Jun 5, 2026

CVE-2026-44903

CVE-2026-44903

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/prometheus/prometheusGo
< 0.311.30.311.3

Affected products

172

Patches

Vulnerability mechanics

References

4

News mentions

0

No linked articles in our index yet.