# RHSA-2026:55800: haproxy security update

RHSA-2026:55800, released June 18, 2026, fixes 2 CVEs in haproxy (version 3.0.5-4.el10_0.3). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-55800
- Platform: Linux
- Released: Jun 18, 2026
- Priority: High (Closes CVE-2026-55204, high severity)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:55800

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [haproxy](https://patchblox.com/security/data/product/linux/haproxy.md) | RHEL 10 | 3.0.5-4.el10_0.3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-55204](https://patchblox.com/security/data/cve/CVE-2026-55204.md) | High | HAProxy - NULL Pointer Dereference in hpack_dht_insert Function | 7.5 | 0.0048 |  |
| [CVE-2026-55203](https://patchblox.com/security/data/cve/CVE-2026-55203.md) | High | HAProxy - Integer Overflow in FCGI Demux Record Length Field | 9.1 | 0.0033 |  |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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