# CVE-2026-4427: golang-github-jackc-pgproto3: A flaw was found in pgproto3

CVE-2026-4427 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-4427, released March 19, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-4427
- Priority: High
- CVSS: 9.1 (high)
- EPSS: n/a
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 19, 2026

## Description

A flaw was found in pgproto3. A malicious or compromised PostgreSQL server can exploit this by sending a DataRow message with a negative field length. This input validation vulnerability can lead to a denial of service (DoS) due to a slice bounds out of range panic.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | alloy sles 15.7 | 1.16.1-150700.15.20.1 | [SUSE-SU-2026:2438-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2438-1.md) | Jun 17, 2026 |
| Linux | golang-github-jackc-pgproto3 Debian 14 | 2.3.3-2 | [DEBIAN-CVE-2026-4427](https://patchblox.com/security/data/fix/linux/debian-cve-2026-4427.md) | Mar 19, 2026 |
| Linux | osbuild-composer RHEL 9 | 0:165.1-2.el9_8 | [RHSA-2026:22714](https://patchblox.com/security/data/fix/linux/rhsa-2026-22714.md) | Jun 24, 2026 |
| Linux | osbuild-composer ol 10 | 0:176-1.0.1.el10_2 | [ELSA-2026-22450](https://patchblox.com/security/data/fix/linux/elsa-2026-22450.md) | Aug 13, 2026 |
| Linux | osbuild-composer ol 9 | 0:175-1.0.1.el9_8 | [ELSA-2026-22714](https://patchblox.com/security/data/fix/linux/elsa-2026-22714.md) | Aug 5, 2026 |
| Linux | osbuild-composer rocky 10 | 0:165.1-2.el10_2.rocky.0.1 | [RLSA-2026:22450](https://patchblox.com/security/data/fix/linux/rlsa-2026-22450.md) | Jun 5, 2026 |
| Linux | osbuild-composer rocky 9 | 0:165.1-2.el9_8.rocky.0.1 | [RLSA-2026:22714](https://patchblox.com/security/data/fix/linux/rlsa-2026-22714.md) | Jun 11, 2026 |
| Linux | osbuild-composer-core RHEL 9 | 0:165.1-2.el9_8 | [RHSA-2026:22714](https://patchblox.com/security/data/fix/linux/rhsa-2026-22714.md) | Jun 24, 2026 |
| Linux | osbuild-composer-core ol 10 | 0:176-1.0.1.el10_2 | [ELSA-2026-22450](https://patchblox.com/security/data/fix/linux/elsa-2026-22450.md) | Aug 13, 2026 |
| Linux | osbuild-composer-core ol 9 | 0:175-1.0.1.el9_8 | [ELSA-2026-22714](https://patchblox.com/security/data/fix/linux/elsa-2026-22714.md) | Aug 5, 2026 |
| Linux | osbuild-composer-worker RHEL 9 | 0:165.1-2.el9_8 | [RHSA-2026:22714](https://patchblox.com/security/data/fix/linux/rhsa-2026-22714.md) | Jun 24, 2026 |
| Linux | osbuild-composer-worker ol 10 | 0:176-1.0.1.el10_2 | [ELSA-2026-22450](https://patchblox.com/security/data/fix/linux/elsa-2026-22450.md) | Aug 13, 2026 |
| Linux | osbuild-composer-worker ol 9 | 0:175-1.0.1.el9_8 | [ELSA-2026-22714](https://patchblox.com/security/data/fix/linux/elsa-2026-22714.md) | Aug 5, 2026 |

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Data as of 2026-11-08T19:12:23Z 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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