# CVE-2026-43002: horizon: An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3

CVE-2026-43002 is fixed in horizon on 1 platform by DEBIAN-CVE-2026-43002 (version 3:25.7.3-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-43002
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 5, 2026

## Description

An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3. There is a write operation to the session storage backend before authentication and thus storage can be exhausted by unauthenticated requests. This is a regression of the CVE-2014-8124 fix.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | horizon Debian 14 | 3:25.7.3-1 | [DEBIAN-CVE-2026-43002](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43002.md) | May 15, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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