---
title: "CVE-2026-33815: pgx contains memory-safety vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-33815/
description: "CVE-2026-33815 (github.com/jackc/pgx/v5 (Go)): Memory-safety vulnerability in github.com/jackc/pgx/v5."
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-07
date_modified: 2026-09-17
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-33815"
kev: false
cvss: 8.3
epss: 0.00858
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-33815: pgx contains memory-safety vulnerability

**Signal:** Normal patch cycle. No exploitation signal; fix it in your next routine update if you are affected. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.9% , percentile 58: FIRST’s model estimates a 0.9% chance of exploitation activity in the next 30 days, higher than 58% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes github.com/jackc/pgx/v5 (Go) < 5.9.0, fixed in 5.9.0 . Check your lockfile, including transitive dependencies.

## What it is

Memory-safety vulnerability in github.com/jackc/pgx/v5.

## Affected packages

- Go `github.com/jackc/pgx/v5` < 5.9.0 → fixed: 5.9.0

## Affected products (CVE record)

- github.com/jackc/pgx/v5 github.com/jackc/pgx/v5/pgproto3: < 5.9.0

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- redhat-SADP CVSS 3.1: 8.3 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.86% probability of exploitation activity in the next 30 days; percentile 58.

## Sources

- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:41019)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:17789)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:36796)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:26636)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:22423)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:24503)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:60388)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:24539)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:25273)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:11070)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:11217)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:13791)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:13829)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:40984)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:24479)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:24475)
- [access.redhat.com](https://access.redhat.com/errata/RHSA-2026:24482)
- [GitHub Advisory GHSA-xgrm-4fwx-7qm8](https://github.com/advisories/GHSA-xgrm-4fwx-7qm8)
- [CVE.org record CVE-2026-33815](https://www.cve.org/CVERecord?id=CVE-2026-33815)
- [NVD entry CVE-2026-33815](https://nvd.nist.gov/vuln/detail/CVE-2026-33815)
- [pkg.go.dev](https://pkg.go.dev/vuln/GO-2026-4771)
- [access.redhat.com](https://access.redhat.com/security/cve/CVE-2026-33815)
- [RHBZ#2455975](https://bugzilla.redhat.com/show_bug.cgi?id=2455975)
- [security.access.redhat.com](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33815.json)
- [github.com](https://github.com/jackc/pgx/issues/2519)
- [github.com](https://github.com/jackc/pgx/issues/2530)
- [github.com](https://github.com/jackc/pgx/commit/6dbad4cafdb8a4daab7ff79c858c95da4b6109e8)

---
Source page: https://erroneo.us/security/cve/CVE-2026-33815/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt