CVE catalog
CVE-2026-44903
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-fe
- Severity
- Medium · CVSS 5.1
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.20% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | prometheus | sid | 3.5.3+ds1-6 | fixed |
| Debian | prometheus | forky | 3.5.3+ds1-6 | fixed |
| Debian | prometheus | trixie | 2.53.3+ds1-2 | vulnerable |
| Debian | prometheus | bookworm | 2.42.0+ds-5+deb12u1 | not affected |
| Cpe | prometheus | Not reported | 3.5.3 | fixed |
| Cpe | prometheus | Not reported | 3.11.3 | fixed |
| Go | github.com/prometheus/prometheus | Not reported | 0.311.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | prometheus | source | sid | 3.5.3+ds1-1 | unimportant | Not reported | [1138261] |
| Debian | prometheus | source | forky | 3.5.3+ds1-1 | unimportant | Not reported | [1138261] |
| Debian | prometheus | source | trixie | (unfixed) | unimportant | Not reported | [1138261] |
| Debian | prometheus | source | bookworm | Not affected | unimportant | Not reported | [1138261] |
| Cpe | prometheus | cpe | Not reported | 3.5.3 | Not reported | Not reported | Not reported |
| Cpe | prometheus | cpe | Not reported | 3.11.3 | Not reported | Not reported | Not reported |
| Go | github.com/prometheus/prometheus | Go | Not reported | 0.311.3 | Not reported | GHSA-FW8G-CG8F-9J28 | Not reported |
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [golang-github-prometheus-prometheus-dev]Affected
Source package: [prometheus]
Details (2)
2.53.3+ds1-2· all · trixieAffected
nvd · prometheus · debian · 13
2.53.3+ds1-2· all · trixieAffected
nvd · prometheus · debian · 13
- [prometheus]Affected
Details (2)
2.53.3+ds1-2· amd64 · trixieAffected
nvd · prometheus · debian · 13
2.53.3+ds1-2· arm64 · trixieAffected
nvd · prometheus · debian · 13
- [promtool]Affected
Source package: [prometheus]
Details (2)
2.53.3+ds1-2· amd64 · trixieAffected
nvd · prometheus · debian · 13
2.53.3+ds1-2· arm64 · trixieAffected
nvd · prometheus · debian · 13
[Debian 12 (Bookworm)]
- [prometheus]Not affected
Details (2)
2.42.0+ds-5+deb12u1· amd64 · bookwormNot affected
nvd · prometheus · debian · bookworm
2.42.0+ds-5+deb12u1· arm64 · bookwormNot affected
nvd · prometheus · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-44903]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-44903]
- [https://osv.dev/vulnerability/GHSA-fw8g-cg8f-9j28]
- [https://security-tracker.debian.org/tracker/CVE-2026-44903]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1292.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]