# CVE-2023-40577: prometheus-alertmanager: Alertmanager handles alerts sent by client applications such as the Prometheus server

CVE-2023-40577 is fixed in 2 products on 1 platform, first by golang-github-prometheus-alertmanager-dev 0.6.2+ds-3ubuntu0.1+esm1, released August 24, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-40577
- Priority: Routine
- CVSS: 5.4 (medium)
- EPSS: 0.0063
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 24, 2023

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | golang-github-prometheus-alertmanager-dev Ubuntu 18.04.6 LTS (bionic) | 0.6.2+ds-3ubuntu0.1+esm1 | [golang-github-prometheus-alertmanager-dev 0.6.2+ds-3ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-github-prometheus-alertmanager-dev-0.6.2-ds-3ubuntu0.1-esm1.md) | Aug 24, 2023 |
| Linux | golang-github-prometheus-alertmanager-dev Ubuntu 20.04 LTS (focal) | 0.15.3+ds-3ubuntu1.2 | [golang-github-prometheus-alertmanager-dev 0.15.3+ds-3ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-github-prometheus-alertmanager-dev-0.15.3-ds-3ubuntu1.2.md) | Aug 24, 2023 |
| Linux | golang-github-prometheus-alertmanager-dev Ubuntu 22.04.1 LTS (jammy) | 0.23.0-4ubuntu0.2+esm1 | [golang-github-prometheus-alertmanager-dev 0.23.0-4ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-github-prometheus-alertmanager-dev-0.23.0-4ubuntu0.2-esm1.md) | Aug 24, 2023 |
| Linux | prometheus-alertmanager Debian 13.5 (trixie) | 0.26.0+ds-1 | [DEBIAN-CVE-2023-40577](https://patchblox.com/security/data/fix/linux/debian-cve-2023-40577.md) | Aug 25, 2023 |
| Linux | prometheus-alertmanager Debian 14 | 0.26.0+ds-1 | [DEBIAN-CVE-2023-40577](https://patchblox.com/security/data/fix/linux/debian-cve-2023-40577.md) | Aug 25, 2023 |
| Linux | prometheus-alertmanager Ubuntu 18.04.6 LTS (bionic) | 0.6.2+ds-3ubuntu0.1+esm1 | [prometheus-alertmanager 0.6.2+ds-3ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-prometheus-alertmanager-0.6.2-ds-3ubuntu0.1-esm1.md) | Aug 24, 2023 |
| Linux | prometheus-alertmanager Ubuntu 20.04 LTS (focal) | 0.15.3+ds-3ubuntu1.2 | [prometheus-alertmanager 0.15.3+ds-3ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-prometheus-alertmanager-0.15.3-ds-3ubuntu1.2.md) | Aug 24, 2023 |
| Linux | prometheus-alertmanager Ubuntu 22.04.1 LTS (jammy) | 0.23.0-4ubuntu0.2+esm1 | [prometheus-alertmanager 0.23.0-4ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-prometheus-alertmanager-0.23.0-4ubuntu0.2-esm1.md) | Aug 24, 2023 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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