Description
Alertmanager handles alerts sent by client applications such as the Prometheus server. An attacker with the permission to perform POST requests on the /api/v1/alerts endpoint could be able to execute arbitrary JavaScript code on the users of Prometheus Alertmanager. This issue has been fixed in Alertmanager version 0.2.51.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| prometheus | alertmanager | <= 0.25.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | prometheus-alertmanager | 0.26.0+ds-1 | — |
| Debian 13 | prometheus-alertmanager | 0.26.0+ds-1 | — |
| Debian 12 | prometheus-alertmanager | No fix yet | — |
| Debian 10 | prometheus-alertmanager | 0.15.3+ds-3+deb10u1 | DLA-3609-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | prometheus-alertmanager | 0.15.3+ds-3ubuntu1.2 | USN-6935-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | prometheus-alertmanager | 0.23.0-4ubuntu0.2+esm1 | USN-6935-1 |
| Ubuntu Pro 18.04 LTS | prometheus-alertmanager | 0.6.2+ds-3ubuntu0.1+esm1 | USN-6935-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | golang-github-prometheus-alertmanager | 0.26.0-150100.4.19.1 | SUSE-SU-2024:0512-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Manager Proxy Module 4.3 | golang-github-prometheus-alertmanager | 0.26.0-150100.4.19.1 | SUSE-SU-2024:0512-1 |
| SUSE Manager Client Tools 15 | golang-github-prometheus-alertmanager | 0.26.0-150100.4.19.1 | SUSE-SU-2024:0512-1 |
| SUSE Manager Client Tools 12 | golang-github-QubitProducts-exporter_exporter | 0.4.0-4.6.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | golang-github-boynux-squid_exporter | 1.6-4.9.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | golang-github-lusitaniae-apache_exporter | 1.0.0-1.21.2 | SUSE-SU-2024:0486-1, SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | golang-github-prometheus-alertmanager | 0.26.0-1.24.2 | SUSE-SU-2024:0486-1, SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | golang-github-prometheus-node_exporter | 1.5.0-4.15.4 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | golang-github-prometheus-prometheus | 2.45.0-1.50.2 | SUSE-SU-2024:0486-1, SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | golang-github-prometheus-promu | 0.14.0-4.12.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | grafana | 9.5.8-1.60.1 | SUSE-SU-2024:0486-1, SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | kiwi-desc-saltboot | 0.1.1687520761.cefb248-4.15.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | mgr-daemon | 4.3.8-1.44.2 | SUSE-SU-2024:0486-1 |
| SUSE Manager Client Tools 12 | mgr-push | 5.0.1-4.21.4 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | prometheus-blackbox_exporter | 0.24.0-3.6.3 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | prometheus-postgres_exporter | 0.10.1-1.17.2 | SUSE-SU-2024:0486-1, SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | python-hwdata | 2.3.5-15.12.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | rhnlib | 5.0.1-24.30.3 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | spacecmd | 4.3.26-38.136.2 | SUSE-SU-2024:0486-1, SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | spacewalk-client-tools | 4.3.18-52.95.2 | SUSE-SU-2024:0486-1 |
| SUSE Manager Client Tools 12 | supportutils-plugin-salt | 1.2.2-9.9.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | supportutils-plugin-susemanager-client | 5.0.1-9.15.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | system-user-grafana +1 | 1.0.0-3.7.2 | SUSE-SU-2024:0191-1 |
| SUSE Manager Client Tools 12 | uyuni-common-libs | 5.0.1-3.33.3 | SUSE-SU-2024:0191-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | golang-github-prometheus-alertmanager | 0.26.0-4.1 | openSUSE-SU-2024:13599-1 |
| openSUSE Leap 15.5 | golang-github-prometheus-alertmanager | 0.26.0-150100.4.19.1 | SUSE-SU-2024:0512-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | alertmanager | 0.26.0-r0 | — |
| Alpine v3.23 | alertmanager | 0.26.0-r0 | — |
| Alpine v3.22 | alertmanager | 0.26.0-r0 | — |
| Alpine v3.21 | alertmanager | 0.26.0-r0 | — |
| Alpine v3.20 | alertmanager | 0.26.0-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | alertmanager | 0.26.0-r0 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | prometheus-alertmanager | 0.26.0-r0 | — |
| Wolfi rolling | promxy | 0.0.94-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/prometheus/alertmanager | < 0.25.1 | 0.25.1 | GHSA-v86x-5fm3-5p7j |
Advisories 9
- WID-SEC-2026-2451 Oracle Siebel CRM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 2, 2026
- WID-SEC-2025-0148 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- USN-6935-1 prometheus-alertmanager vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3609-1 prometheus-alertmanager - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2024:0191-1 Security Beta update for SUSE Manager Client Tools SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13599-1 golang-github-prometheus-alertmanager-0.26.0-4.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0512-1 Security update for golang-github-prometheus-alertmanager SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0486-1 Security update for SUSE Manager Client Tools SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2025-0021 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Jan 22, 2025